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Question

Pipe A can fill a tank in 12 hours and pipe B can empty the tank in 18 hours. Both the pipes are opened at 6 A.M. and after some time, pipe B is closed. The tank is full at 8 P.M. What was the time at which pipe B was closed?

A

9 AM

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B

9.30 AM

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C

10 AM

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D

10.45 AM

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E

11.30 AM

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Solution

The correct option is A 9 AM The tank was full in 14 hours → Pipe A worked for complete 14 hours. Let pipe B worked for x hours. ∴ 1412−x18=1 x=3 hours Hence, pipe B was closed at 9 A.M.

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