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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)

 Subject Author Date my solution/your solution Awdreye 2005-06-28 08:07:19 WHAT KIND OF SOLDIER ARE YOU, RECRUIT? john 2005-06-16 19:47:56 re: without to much cheking... john 2005-06-16 19:30:18 re(2): Repeat Ken Haley 2004-11-04 05:35:36 re: Repeat Jim 2004-07-20 12:06:44 without to much cheking... Cesar Ali 2004-07-08 10:43:54 simple answer omar 2004-02-21 15:37:57 re: Not that long - Too slow Brian Smith 2003-10-15 09:44:25 Not that long Krysta Harty 2003-10-14 19:53:32 ummmm Lewis 2003-06-07 08:04:18 Lowest solution Danny 2003-02-06 06:36:51 Repeat cges 2002-12-12 06:08:46 No Subject Amanda 2002-10-08 10:03:43 4people/bridge baconfats 2002-05-11 03:32:32

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