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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 | |