1. A tank is filled in 5 hours by three pipes A, B and C. The pipe C is twice as fast as B and B is twice as fast as A. How much time will pipe A alone take to fill the tank?

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By: guest on 01 Jun 2017 05.47 pm

Suppose pipe A alone takes x hours to fill the tank. Then, pipes B and C will take x and x hours respectively to fill the tank. 2 4 1 + 2 + 4 = 1 x x x 5 7 = 1 x 5 x = 35 hrs.