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Question

Pipes P and Q can fill a tank in 12 hours and 15 hours respectively, while a third pipe C can empty the tank in 24 hours. If all three pipes are opened simultaneously at 4:00
a.m., at what time will the tank be 65% full?

A 10 am

B 9 am

C 9.15 am

D 10.25 am

E None of these

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