Q. A pipe fills a tank in 20 hours. Another pipe empties it in 30 hours. If both are opened together, in how many hours will the tank be filled?
✅ Correct Answer: (C)
60 hours
Explanation: Net rate = 1/20 − 1/30 = 1/60.
Explanation by: Kanak Sharma
Net rate = 1/20 − 1/30 = 1/60.