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?
Q1. 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: 35 hrs
Explanation: Let A's rate = r; B = 2r, C = 4r; combined 7r = 1/5 → r = 1/35; A alone takes 35 hours.