Q. Pipe A can fill a tank in 30 hours. Pipe B can fill it in 60 hours. Pipe C empties it in 20 hours. If all are opened together, the tank will be filled in?
✅ Correct Answer: (C)
No filling
Explanation: Net rate = 1/30 + 1/60 − 1/20 = 0.
Explanation by: Kanak Sharma
Net rate = 1/30 + 1/60 − 1/20 = 0.