Question

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

Answer 1

Answer: Option C

Explanation:

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.