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Pipe A alone can fill a tankin 8 hours .Pipe B can fill it in 6 hours . If both the pipes are operated and after 2 hours pipe A is closed, then the other pipe will fill the tank in.

Pipe A alone can fill a tankin 8 hours .Pipe B can fill it in 6 hours . If both the pipes are operated and after 2 hours pipe A is closed, then the other pipe will fill the tank in. Correct Answer 1 1/2 hours

Part of the tank filled by pipe A and B in 2 hours = 2 ( 1/6 + 1/8 ) = 2 {(4 + 3)/24} = 7/12 Remaining part = 1 - 7/12 = 5/12 This part is filled by pipe B. ∴ Required Time = (5/12)x 8 = 10/3 hours

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