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 4 people want to cross the bridge before it will collapse

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abuibi
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Join date : 2010-12-20
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PostSubject: 4 people want to cross the bridge before it will collapse   Wed Dec 22, 2010 3:04 pm

Hi guys

Here is another puzzle.

A bridge will collapse in 17 minutes.

4 people want to cross it before it will collapse. It is a dark night and there is only one torch between them.

Only two people can cross at a time.

"A" takes a minute to cross.
"B" takes 2 minutes.
"C" takes 5
and "D" takes 10 minutes

How do they all cross before the bridge collapses?

NOTE: THIS PUZZLE ARE NOT MY OWN THEY WHERE ACQUIRED FROM DIFFERENT SOURCES FROM INTERNET
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