Question

Pipes P and Q can fill a tank in 14 hours and 21 hours respectively, while pipe R can empty the completely filled tank in 42 hours. If all the three pipes are opened together at 3 p.m., then at what time will 60% of the tank be filled?

A 11:48 pm
B 9:18 pm
C 3:32 pm
D 2:00 pm
E None of these
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