. right time - you can cross the bridge. So the total time in Step 2 is 10 + 1 = 11. But you have to remember torch has light towards one direction. So Total time take to cross the bridge by 4 campers will be 2 + 1 + 10 + 2 + 2 = 17 minutes. (mce). B takes 2 minutes to cross the bridge. 4 people want to cross it before it will collapse. so total= 11+10 =21mins. Only two people can cross at a time. Given below is the question along with its answer and explanation. Then Louis and Anne walk on the bridge, which takes 10 minutes. The total time will be 2 + 11 + 2 + 2 = 17 minutes. There is no mention of his mass, and so we must therefore assume that if "the man weighs exactly 98 pounds", and he is holding the three 1 pound apples, as is stated, the 98 pounds INCLUDES the 3 apples already. Find the minimum total time in which all persons can cross the bridge. If it is tough to cross without one.. A bridge will collapse in 17 minutes. He could juggle as many as he likes across the bridge. Hence, the juggler imparts 98 + 3 = 101 pounds on the bridge. Scroll down for a clue and further down for the answer. Then the 8 and 12 second persons will cross the bridge. hand at any instant of time!) Euler proved the number of bridges must be an even number, for example, six bridges instead of seven, if you want to walk over each bridge once and travel to each part of Königsberg. Finally Jim and Jeanne … So we have: One takes 1 minute to cross, another 2 minutes, another 5, and the last 10 minutes. One can cross the bridge in 1 minute, another in 2 minutes, the third in 5 minutes, and the slowest camper takes 10 minutes to cross. What is the shortest time needed for all four of them to cross the bridge? About Brain Test Game: “Brain Test is an addictive free tricky puzzle game with a series of tricky brain teasers. In the Middle Ages, Königsberg became a very important city and trading center with its location strategically positioned on the river. English; Home; Popular Tags; Latest Puzzles; Best Puzzles; Home; B ; Bridge Puzzle ; Crossing The Bridge Puzzle. Answer to Puzzle #25: Bridge crossing in 17 Minutes with Torch. Crossing 7: Chloe switches places with Lexa and her agent, who row to the far side. Each man walks at a different speed. Puzzle: Four people need to cross a rickety bridge at night. Show Answer for Puzzle. 932.8K Views. What is the shortest time needed for all four of them to cross the bridge? 80.14 % 48 votes. He is effectively "juggling" one apple if he staggers the juggling. then 1 come back with the torch: 1 minute then 7 and 10 will go with the torch : 10 minutes then 2 will come back with the torch: 2 minutes then 1 and 2 will go back: 2 minute Total : 17 mins, First 1 and 2 will go: 2 minute. Four friends need to cross a dangerous bridge at night. Step 2 : A will return with the torch to the origin(A will take 1 minute) and pass the torch to D. Now D will go along with C and A will remain at the origin. Hence question to challenge 10min logic starts with, Who holds the torch when 1min guy and 10 min guys starts crossing? Puzzle: There are 4 persons (A, B, C and D) who want to cross a bridge in night. That’s all for Bridge Crossing Puzzle, If you liked it, please share your thoughts in a comments section and share it with others too. you have crossed the bridge! There should be only two persons…including the person with torch.. 10 Mins is enough those 4 persons are cross the bridge. There are several variations of this puzzle. A takes 1 minute to cross the bridge. Objects thrown up will be at the same speed falling at the height they were thrown from. Due to the popularity of the last little puzzled I posted, here's another for you to have a go at. How can the campers make it across in exactly 17 minutes? It would be still be tough for the one who returns.. they ve told it is tough to cross without a torch. “it” refers to a torch here. “A” takes a minute to cross. Then 1 and 2 go again, it makes a total of 17 minutes. A pair must walk together at the rate of the slower person: Rachel: - takes 1 minute to cross In 1254, Teutonic knights founded the city of Königsberg under the lead of Bohemian King Ottoker II after their second crusade against the Prussians. He may, however, collapse at seeing the price of an apple that weighs a pound... (Sorry for shouting, the laws of physics made me do it!). The catch is that at most two people can cross at once, otherwise the bridge will crush under their weight, and the group only has access to one torch, which must be carried to cross the bridge. Crossing the Bridge Puzzle (Bridge and torch problem) 2. 0.85 seconds. All depends on good torch, First 10min guy & 7min guy starts- Tourch with 10 min guy, As soon as 7min guy reaches the other end 2 min guy will start (10 min guy is still in bridge with tourch and with 3 min left to finish his task), as soon as the 2min guy crosses (10 min guy still on bridge with 1min left and tourch in hand) 1min guy will start and finishes with the 10min guy. It is dark, and they have to light the path with a flashlight. Then 1 and 2 go again, it makes a total of 17 minutes. Not all people take the same time to cross the bridge. RETURN: (1) comes back. The bridge is too dangerous to cross without a flashlight, and it’s only strong enough to support two people at any given time. (10Mins=7Mins+2Mins+1Mins), 17 is not correct as it does not take into consideration time for return back. Hashi is played on a rectangular grid with no standard size. If Larry then returns with the flashlight, a total of 20 minutes have passed and you have failed the mission. Share riddle. Bridge can hold at max two people at a time. Crossing The Bridge Puzzle @ Puzzles.pics | click for more.. English . So, C and D will take a total time of 10 minutes (not 7 minutes because the time needed for D to cross the bridge is 10 minutes so C has to slow down for D). is left as an exercise to the reader. He prays that the verticle g's his body creates doesn't lead to his demise, and he hopes the engineer who calculated the weight limit left a margin for error. There is a bug in the question. Jim walks back with the torch light, which takes 1 minute. 850 milliseconds and can move your arms in the motion described - at just the UP: (1,2) goes first. He could also cross the bridge 3 times carrying each apple every time. See this puzzle to understand more. Different riddles testing will challenge your mind. Not all people take the same time to cross the bridge. Question. Artwork from the eighteenth century shows Königsberg as a thriving city, where fleets of ships fill the Pregel, and thei… This should work as long as he doesn't throw too hard. A juggler who weighs 98 pounds juggling 3 apples weighing 1 pound each imparts a The rules are simple. It says a single person cannot cross bridge but while returning a single person is coming back………….. :p. okay But when 10 min guy reaches at the point which is 3 min away from other side he must be facing his torch in the direction in which he is traveling. Note: Slower person’pace is given by larger time. So 16 can be answer, as it satisfies all the conditions. Brain Out Level 121 Cross the bridge – Walkthrough . If your arms are 2 ft long, you have 4 feet to lower the apples. so total= 10+1=11mins. Our story begins in the 18th century, in the quaint town of Königsberg, Prussia on the banks of the Pregel River. It is in the category of river crossing puzzles, where a number of objects must move across a river, with some constraints. Four people come to a river in the night. 1)1&2 Go>> Once 1 reaches other side, 2 Returns back, Total step time=1+1=2 2)2&7 Go>>Once 2 reaches other side, 7 Returns back, Total step time=2+2=4, Total Time=6. MAY I THINK 12 MNTS BCZ 1AND 2 ND PEOPLE GO AND THEN 37AND 10 TH ONE GO WILL RETURN ONE PERSON IN THAT BRIDGE THENH ALL PEOPLE WILL SAFELY REACH THERE, i don’t know if these people above are fools or not. The solution views each bridge as an endpoint, a vertex in mathematical terms, and the connections between each bridge … One such puzzle that has been doing the rounds on social media is a series of riddles about 4 friends who need to cross a bridge. Our website is built with the only purpose of sharing Puzzle Page Answers, Cheats and Solutions with you. They have one torch and, because it's night, the torch has to be used when crossing the bridge. and where is that devil when one of them is returning back all along..? Step 1 : First A and B will cross the bridge and since they have 1 torch, it will take 2 minutes for them to reach the other end of the bridge (not 1 minute because time needed for B is 2 minutes so A has to slow down for B as they have only one torch). 3)Lastly, 7 and 10 Goes, Reaches other side in 10 min, Total Time =2+4+10. Hashi (Hashiwokakero) also known as Bridges is a logic puzzle with simple rules and challenging solutions. The bridge is too dangerous to cross alone. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. Download (Vote(s)) Next : Finding The Fastest Horses - Interview. The 1 second person will stay on the other side of the bridge and 3 second person will come back with the torch. Since g=32 ft/sec/sec and s=0.5*a*t*t, Sir Isaac says that the resultant force that each apple imparts on the juggler is 25. If 1 & 2 go and 1 come back then it is 3 mins, then 1 & 7 go (additional 7 mins) and 1 come back (add 1 min) then 1 & 10 go so additional 10 mins. The flashlight must be walked back and forth; it cannot be thrown, etc. (p7 has the torch) The puzzle states that the man currently WEIGHS 98lbs. air, and one third in her hand. UP:(1,10) goes next. This is not an answer for using CLP (FD) but just to show the two solutions that exist for this puzzle with cost equal or lower than 60 (the text is too big to put in a comment). If 1 is strong enough to carry people then 1 carry 10 with torch & returns : 2 minutes 1 carry 7 with torch & returns : 2 minutes 1 carry 2 with torch & ends journey : 1 minute. The bridge is only strong enough to support two people at a time. Answer: Hold your finger on the cracked portion of the bridge and tap on the car with your another finger. It is a dark night and there is only one torch between them. Bono - 1 minute to cross Edge - 2 minutes to cross Adam - 5 minutes to cross Larry - 10 minutes to cross For example: If Bono and Larry walk across first, 10 minutes have elapsed when they get to the other side of the bridge. p1 reaches back to b1. At t = 0 min, p1, p2 start journey to cross towards b2 from b1 (p1 has the torch) At t = 1 min, p1 reaches b2 and starts back towards b1. Some cells start out with numbers from 1 to 8 inclusive; these are the islands. They start on the same side of the bridge. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. Then 7 and 10 go and 2 comes back. t*t = 4/(0.5*32/3) or approximately 0.75 sec*sec, thus t is approximately Whenever two people cross the bridge, they will always take the time of the person who take the longest to cross it since they have to be together and if they don’t, the devil will eat them. People that cross the bridge must carry the lamp to see the way. C takes 5 minutes to cross the bridge. Step 4 : Now A and B will cross the bridge once again and this time the time required will be same as that of step 1 i.e 2 minutes. UP:(1,7) goes next. motion (accelerating the apples down at g/3). There is no mention of his mass, and so we must therefore assume that if "the man weighs exactly 98 pounds", and he is holding the three 1 pound apples, as is stated, the 98 pounds INCLUDES the 3 apples already. Brain Out is a tricky puzzle game that consists of different kinds of riddles and problems that will surely tease your mind. I feel that answer does not suit the frameset of the question. Therefore, if you can run fast enough to cross the bridge in under Unfortunately, they only have one flashlight and it only has enough light left for seventeen minutes. It is 17 mins. Ask Question Asked 5 years, 2 months ago. He waits until there is a full moon. Mathematics is ok, but unable to conclude this statement.. Ans can be 16 also. RETURN:(1) comes back. Read | '1 To 9 All Digits To Be Used' Whatsapp Puzzle With Answer And Solution Inside. ), He eats all three apples, digests them, loses a pound by excreting and urinating then walks over, He sacrifices a part of his body weighing one pound. The bridge is weak and only able to carry the weight of two of them at a time. Step 3 : When C and D reach the other end of the bridge they will pass the torch to B who has already reached there in Step 1. What is the shortest time needed for all four of them to cross the bridge? The bridge is only strong enough to support two people at a time. Your email address will not be published. All Answers for Brain Test [UPDATED] : Brain Test Answers. it is explained well above and again they are taking 21 min the ans is 1 & 2 : 2min 1come back : 1min 10 & 7 : 10min 2 come back: 2min 1 & 2 : 2min TOTAL 17min, First 1 and 2 will go – 2 minute. How would you feel if i was about to offer a … people – p1 p2 p7 p10 (number denotes time taken for crossing) Solution: 13 mins. Crossing The Bridge Puzzle. isn’t it 10 mins as the person who takes 10 min to cross, start with torch in hand and with him persons those take 1,2 and 7 mins go one by one. 1 and 2 go first, then 1 comes back. No sir, that doesn’t necessarily make sense. He runs really fast across the bridge, and lets the centripetal force kick in and take some of that weight off. ), A&B > 2 mins A goes back 7 Mins A goes back 10 mis, 10min is only needed ,assuming the range as entire bridge first the one min guy as well as the 10 min guy cross as the 1 min guy crosses he holds torch so others can see d light now there is only 1 person so the 7 minb guy can cross,he completes then can the other 1 min with the 10 min guy so it can take only 10 min, not mentioned that all people standing on same side assume 2 people standing on one side and 2 on other side. Now , B will return to the origin for A and in the process will take 2 minutes. There are no tricks--the … If two men cross together, they must walk at the slower man's pace. It is 17 mins. total=2mins. When two people cross the bridge together, they walk at the speed of the slower person. Not all people take the same time to cross the bridge. Answered. Four friends need to cross a bridge. He left the digested apples so he didn't cross the bridge WITH the apples. The bridge is only strong enough to support two people at a time. Four people need to cross a rickety rope bridge to get back to their camp at night. because you are also accelerating the mass of your arms. There is only one torch with them and the bridge cannot be crossed without the torch. Sorry, 10min possible, 7min holds the torch, 10 and 1 cross, when 1 finishes 2 starts crossing , when 2 finish 7 starts crossing , finally 7 and 10 finish crossing together ie 1+2+7 = 10. Answer of Bridge Crossing Puzzle :- 17 minutes. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. No more than two people can cross the bridge simultaneously, and the group has only one flashlight. Jeanne comes back with the torch light, it takes 2 minutes. They will wait infinitely. Not all people take the same time to cross the bridge. at 2g upwards. View full lesson: https://ed.ted.com/lessons/can-you-solve-the-bridge-riddle-alex-gendlerWant more? I like it people challenge it with 10 min. mean force of 101 pounds on the bridge. This page was last edited on 20 December 2017, at 22:03. then 2 come back with the torch: 2 minute then 7 and 10 will go with the torch : 10 minutes then 1 will come back with the torch: 1 minutes then 1 and 2 will go back: 2 minute Total : 17 mins, First 1 and 2 will go: 2 minute. First 1 and 2 will go: 2 minute. Answer: the number of bridges. All in one end within 10min. 1 and 2 go first, then 1 comes back. It clearly says that –Bridge is too dangerous–means you need to be careful for each step—-If you can show the torch from one side of the bridge –where is danger ?? Which do you think is more important to solve this problem: the number of bridges or the location of each bridge? With the additional gravitational pull, he can successfully cross the bridge. 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