Bridge Puzzle*

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I have a math puzzle that I just can't get. 

You have 4 people (A, B, C and D) that need to cross a bridge under 13 min and only 1 flashlight. You can only go with the flashlight, no more than 2 persons at a time, and always as fast as the slowest person. To cross the bridge persons need: 
A=1min; B=2min; C=5min; D=6min. 
How do you get all 4 of the across in only 13 min? 

P.S. they can't go on each others back! 
A.

* This puzzle is one of several well-known puzzles of this type. In fact, it's a clever version of traditional crossing river puzzles.

 

Mini-Contest 5 - Bridge Puzzle is FINISHED

 
It was our fifth mini-contest. Because of some technical problem now we have the first six+one correct answers and propose this contest's results and some details about the puzzle and its solution. With this Mini-Contest 5 is finished.
 
 

Contest Results

 
The winners are:
1. Jensen Lai.
2. Hüsnü Sincar.
3. Nicole Takahashi.
4. Tanya Bulls.
5. Nigel Wilson.
6. Terry & Lisa.
7. Alex Packard.
 
Posted: January 24, 2002  |  Last Updated: July 8, 2007
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