Q. A tank can be filled by two pipes in 10 and 15 hours respectively. Due to a leak, the tank takes 30 hours to fill. In how many hours can the leak empty the full tank?
✅ Correct Answer: (B)
30 hours
Explanation: Leak rate = (1/10 + 1/15) − 1/30 = 1/30.
Explanation by: Kanak Sharma
Leak rate = (1/10 + 1/15) − 1/30 = 1/30.