A: The tank is filled in 10 hours by 3 pipes. The pipe C is twice as fast as B and B is twice as fast as A. So, it takes 10 - 2 - 1 = 7 hours for pipe 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