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Question

Pipes P and Q can fill a tank in 10 hours and 20 hours respectively, while pipe C can empty the full tank in 30 hours. If all the three pipes are opened together at 6
a.m., then at what time will 70% of the tank be filled?

A 1 am

B 12 pm

C 5 pm

D 8 am

E None of these

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