Question

The time taken by pipe B3 alone to fill an empty tank completely is half of the time taken by pipe B1 alone to fill the same tank completely. Pipe B2 alone can empty the completely filled tank in 75 hours. Pipe B2 and B3 together can fill an empty tank completely in 37.5 hours. If the efficiency of pipe B1 is 70% less than the efficiency of pipe B4, then the time taken by pipe B4 alone to fill an empty tank completely.

A 20 hours
B 10 hours
C 30 hours
D 15 hours
E 25 hours
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