Word Games & Puzzles - Lateral Thinking
5. 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.
Solution 1
Bono & Edge cross = 2 minutes (total = 2)
Bono goes back = 1 minutes (total = 3)
Larry & Adam cross = 10 minutes (total = 13)
Edge goes back = 2 minutes (total = 15)
Bono & Edge cross = 2 minutes (total = 17)
Solution 2
Swapping Bono and Edge.
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