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A tank has two pipes P and Q that can fill it in 12 hours and 18 hours respectively.

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A tank has two pipes P and Q that can fill it in 12 hours and 18 hours respectively. There is also a waste pipe R attached to the tank. When all the three pipes are opened together, the empty tank is full in 11 1/4 hours. How long will the waste pipe take to empty the full tank? (in minutes)

(A) 20

(B) 22

(C) 24

(D) None of these

1 answer

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A tank has two pipes P and Q that can fill it in 12 hours

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