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Four people on a bridge. (Posted on 2002-04-14) Difficulty: 2 of 5
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: ( You must be logged in to post comments.)
  Subject Author Date
my solution/your solutionAwdreye2005-06-28 08:07:19
WHAT KIND OF SOLDIER ARE YOU, RECRUIT?john2005-06-16 19:47:56
re: without to much cheking...john2005-06-16 19:30:18
re(2): RepeatKen Haley2004-11-04 05:35:36
Questionre: RepeatJim2004-07-20 12:06:44
Solutionwithout to much cheking...Cesar Ali2004-07-08 10:43:54
simple answeromar2004-02-21 15:37:57
re: Not that long - Too slowBrian Smith2003-10-15 09:44:25
Not that longKrysta Harty2003-10-14 19:53:32
SolutionummmmLewis2003-06-07 08:04:18
Lowest solutionDanny2003-02-06 06:36:51
SolutionRepeatcges2002-12-12 06:08:46
No SubjectAmanda2002-10-08 10:03:43
4people/bridgebaconfats2002-05-11 03:32:32
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