April 21, 2014

Homework Help: brain teaser

Posted by Tony on Wednesday, September 14, 2011 at 3:00am.

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 and other tricks like that are not needed to solve the problem. The solution is simply a matter of allocating resources in a certain order. 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.

Answer this Question

First Name:
School Subject:

Related Questions

Brain Teaser - What is the answer for this visual brain teaser? ii 00 00 00 00
math brain teaser - Here are you a brain teaser. You have to buy at least on of...
teaser - what is this brain teaser ioooo Riddles and brain teasers belong in the...
brain teaser - what does this mean? i i 0 0 0 0 0 0 0 0
brain teaser - 54=C. in a D. with the J's what
Math - Brain Teaser 85=the A N to be E from the W M P
brain teaser help - SR=D+D+P+V+C+C+D+P lateral thinking: DEILST
Music - I have a few questions about the circle of forths. Alright so the circle...
Biology - Another brain teaser I can't get: What are Mr. Rahn's favorite states...
math brain teaser - more it it thani what does that mean??? also: EVELATOR and: ...