Question

Pipe A can fill a tank in 50% less time than it takes pipe B to empty it, while pipe C can fill the same tank in 25% less time than pipe B's emptying duration. If pipe B requires 60 hours to drain the tank completely, how long will it take to fill the tank to 70% of its capacity when pipes A, B, and C operate simultaneously?

A 12 hours
B 24 hours
C 18 hours
D 36 hours
E None of these
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