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## 'U2'

Logic puzzles require you to think. You will have to be logical in your reasoning.

 Puzzle ID: #515 Fun: (2.8) Difficulty: (2.3) Category: Logic Submitted By: kaila912 Corrected By: Winner4600

`U2` has a concert that starts in 17 minutes and they must all cross a bridge to get there. All four men begin on the same side of the bridge. You must help them across to the other side. It is night. There is one flashlight. A maximum of two people can cross at one time. Any party who crosses, either 1 or 2 people, must have the flashlight with them. The flashlight must be walked back and forth, it cannot be thrown, etc. Each band member walks at a different speed. A pair must walk together at the rate of the slower man`s pace:

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. If Larry then returns with the flashlight, a total of 20 minutes have passed and you have failed the mission. Your goal is to get all the men across in 17 mins or less.

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 Grimoire Oct 02, 2001 I was asked this question in an interview once! gakuka Mar 25, 2002 So Edge can actually walk it back the first time too then. Huh, good puzzle. SandPman May 12, 2002 Yeah, but I saw this on another web site yesterday. O_wise_one May 21, 2002 I've seen this one before, but it's still a good one! andmar22 Jun 13, 2002 One of the combinations I didn't think of, very good. SkEwL_gUrl Jul 26, 2002 FYI : I heard this teaser is one of the questions that potential microsoft employees are asked and that misrosoft expects u to answer it in five minutes or less. klopper Aug 12, 2002 I really liked this one bmotts Aug 12, 2002 Yup I heard the Microsoft thing too... dustomatic Nov 29, 2002 It's always a good one I also have found more ways SPUTNIK2 Jan 29, 2006 well i was thinking that they must have carried one person on their backs, like piggyback!! good teaser, thanks TehIgnored Mar 14, 2006 It's like the old wolf, goat, bag of corn, and farmer riddle...cept with a few added variables.... i got this in a little under 3 minutes. jntrcs Mar 25, 2006 why u2 did u really need to use a band? o well i loved it