Bridge crossing Riddle

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Question: There are four people at the end of bridge. They take following time to cross the bridge: 1st: 1 min 2nd: 2 min 3rd: 7 min 4th: 9 min Condition:  1. They have only one torch and they can't cross bridge without torch. 2. and only 2 person can cross bridge at a time. Solution: CLICK HERE POST YOUR OPINION IF YOU HAVE BETTER SOLUTION

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Question:
There are four people at the end of bridge. They take following time to cross the bridge:
1st: 1 min
2nd: 2 min
3rd: 7 min
4th: 9 min

Condition: 
1. They have only one torch and they can't cross bridge without torch.
2. and only 2 person can cross bridge at a time.


Solution:
CLICK HERE

POST YOUR OPINION IF YOU HAVE BETTER SOLUTION