A cistern is normally filled in 8 hours but takes two hours longer to fill because of a leak in its bottom. If the cistern is full, the leak will empty it in?
Q1. A cistern is normally filled in 8 hours but takes two hours longer to fill because of a leak in its bottom. If the cistern is full, the leak will empty it in?
Answer: 40 hrs
Explanation: With no leak, the pipe fills in 8 hrs; with leak it fills in 10 hrs; net fill rate difference = 1/8−1/10 = 1/40, so the leak empties the cistern in 40 hours.