Others Maths Puzzle

ONE PIPE IS 10 METER LONG IF MAN CLIMB IN A PIPE 3 METER AND DOWN 2 METER IN 1 HOUR THEN HOW MANY HOUR CLIMB THE MAN IN PIPE..

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Others Other Question

There are four persons A,B,C and D. They are travelling at night. one bridge come in their way. The bridge has a capacity to hold only two persons at one time. They have only torch and one torch is mandatory to cross the bridge. A,B,C and D can individually cross the bridge in 2,3,4 and 5 min respectively.
option
1. Name two persons out of these four who will take minimum time to cross the bridge?
2. Name two persons who will take maximum time to cross the bridge.
3. who will go first?
4. who will go last?
1,1,2,?,24,120,720