1.

Pipe A takes 10 hours more than Pipe B to fill a tank. Pipe C(which is equally efficient as Pipe A and Pipe B together), fills the same tank in 12 hours. In how many hours will Pipe A, Pipe B and Pipe C fill the tank if Pipe A is accompanied by B and C on alternate hours.

A. 20 hours
B. 30 hours
C. 10 hours
D. 5 hours
E. None of these
Answer» D. 5 hours


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