Q. Pipe A can fill a tank in 10 hours while pipe B can empty it in 15 hours. If both are opened together, how long will it take to fill the tank?
✅ Correct Answer: (C)
30 hours
Explanation: Net rate = 1/10 − 1/15 = 1/30.
Explanation by: Hriday
Net rate = 1/10 − 1/15 = 1/30.