A: The pipe B's rate of filling is a and the rate of filling the tank by C is b * 2 and by B is a * 2. So, it takes 10 - b * a = 70 hours for A alone to fill the tank. The answer is (C).
Answer the following multiple choice question with options (a), (b), (c), (d), (e) by reasoning step-by-step.
Q:A tank is filled in 10 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 Choices: A)30 hours B)35 hours C)70 hours D)50 hours E)58hours