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 : Option A
Explanation : C = 2B
B = 2A
A : B = 1 : 2
B : C = 1 : 2
Now, A : B : C
1: 2 : 4
A + B + C = 5h
7 = 5 h
1 = 35 hr
A = 35 hr
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