Q. Two inlet pipes fill a tank in 5 hours and 10 hours respectively. If an outlet pipe empties the tank in 20 hours, how long will the tank take to fill?
✅ Correct Answer: (A)
4 hours
Explanation: Net rate = 1/5 + 1/10 − 1/20 = 1/4.
Explanation by: Hriday
Net rate = 1/5 + 1/10 − 1/20 = 1/4.