A tank is filled by three pipes, A, B, and C. A fills 1 / 4 of the tank in 1 hour, B fills 1 / 6 of the tank in 1 hour, and C fills 1 / 8 of the tank in 1 hour. How long will it take to fill the tank if all three pipes are open?
Q1. A tank is filled by three pipes, A, B, and C. A fills 1 / 4 of the tank in 1 hour, B fills 1 / 6 of the tank in 1 hour, and C fills 1 / 8 of the tank in 1 hour. How long will it take to fill the tank if all three pipes are open?
Answer: 2.4 hours
Explanation: Combined rate = 1 / 4 + 1 / 6 + 1 / 8 = (6 + 4 + 3) / 24 = 13 / 24.