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"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 bewalked 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.
Notes : There is no trick behind this. It is the simple movement of
resources in the appropriate order.
There are two known answers to this problem.
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