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
(It's always the drummer that's the slacker!!)
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.
This is based on a question Microsoft gives to all prospective employees.
Note: Microsoft expects you to answer this question in under 5 minutes!
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