Q. A pipe fills a tank in 14 hours. Due to a leak, it takes 21 hours to fill. In how many hours can the leak empty the full tank?
✅ Correct Answer: (A)
42 hours
Explanation: Leak rate = 1/14 − 1/21 = 1/42.
Explanation by: Hriday
Leak rate = 1/14 − 1/21 = 1/42.