A: The rate of filling of tank by pipe C is 10 / 2 = 2.5 litres per hour. The rate of filling of tank by pipe B is 10 / 2 = 5 litres per hour. The rate of filling of tank by pipe A is 5 / 2 = 2 litres per hour. So it will take pipe A alone to fill the tank in 10 - 2.5 - 5 - 2 = 70 hours. 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