Question

Pipe C can empty a tank in 30 hours, while pipes A and B can fill it in 15 hours and 20 hours, respectively. First, pipes B and C are opened together until 40% of the tank is filled. Then, the remaining part of the tank is filled by pipe A alone. Find the total time taken to fill the entire tank.

A 12 hrs
B 18 hrs
C 24 hrs
D 10 hrs
E None of these
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