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. Pipes and Cisterns
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. Pipes and Cisterns
Answer: 40 hrs
Explanation: Fill rate = 1/8 per hour; with the leak the net fill rate = 1/10 per hour, so the leak rate = 1/8 − 1/10 = 1/40, meaning it empties the cistern in 40 hours.