A: If pipe A fills the tank in 10 hours then pipe C fills the tank in 10 hours because 10 x 2 = 20. Pipe B fills the tank in 10 hours because 20 x 2 = 40. Pipe C fills the tank in 40 hours because 40 x 2 = 80. Pipe A alone fills the tank in 70 hours because 80 - 20 = 70. 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