Two pipe s A and B can fill a tank in 10 hours and 20 hours &nb

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Question

Two pipe s A and B can fill a tank in 10 hours and 20 hours respectively . While a third pipe C can empty the full tank in 25 hours . All the three pipes are opened in the beginning. After 5 hours C is close . In how much time , will the tank be full ?

Options:

A . 2 hr.

B . 3 hr.

C . 4 hr.

D . 5 hr.

Answer: Option B

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