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 Four people on a bridge. (Posted on 2002-04-14)
Four people need to cross a bridge at night. They have one flashlight for the four of them, but the bridge is only wide enough for two to cross at a time. Because it's so dark, anyone crissing the bridge must do so with the flashlight.

Person A can walk across in 1 minute. Person B takes 2 minutes; person C -- 5 minutes, and finally person D needs a full 10 minutes to cross. Naturally, if two people are crossing the bridge, they move with the speed of the slower person.

What is the shortest amount of time it will take for all four to get to the other side?

 See The Solution Submitted by levik Rating: 3.6875 (16 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
 re: Not that long - Too slow | Comment 7 of 14 |
(In reply to Not that long by Krysta Harty)

There is a faster method which takes 17 minutes.
 Posted by Brian Smith on 2003-10-15 09:44:25

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