One tap can fill a cistern in 2 hours and another can empty the cistern in 3 hours. How long will they take to fill the cistern if both the taps are opened?
Q1. One tap can fill a cistern in 2 hours and another can empty the cistern in 3 hours. How long will they take to fill the cistern if both the taps are opened?
Answer: 6 Hours
Explanation: Net filling rate = 1/2 − 1/3 = 1/6 of the cistern per hour; the cistern fills completely in 6 hours.