Pipes & Cisterns · Question 6 · Medium
A pipe can fill a tank in 4 hours. Because of a leak, it takes 5 hours to fill. In how long can the leak alone empty the full tank?
- 9 hours
- 1 hour
- 20 hours
- 16 hours
Answer and explanation
Answer: C. 20 hours
Explanation: Leak rate = 1/4 − 1/5 = 1/20 tank per hour, so the leak empties it in 20 hours.
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