Q. Pipe A fills a tank in 3 hours and pipe B empties it in 6 hours. If both are opened together, how long will it take to fill the tank?
✅ Correct Answer: (C)
6 hours
Explanation: Net rate = 1/3 − 1/6 = 1/6.
Explanation by: Hriday
Net rate = 1/3 − 1/6 = 1/6.