Question

Pipe 'A' is 5 times as efficient as pipe 'B'. Pipe 'C', which is one-fifth as efficient as pipe 'B', can fill a tank alone in 25 hours. Find difference between time taken by pipe 'C' to fill 60% of the tank and time taken (in minutes) by pipe 'A' to fill the tank completely.

A 900 minutes
B 870 minutes
C 840 minutes
D 810 minutes
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