Pipes & Cisterns · Question 11 · Medium
Pipes & Cisterns question 11
Pipes A and B can fill a tank in 15 minutes and 20 minutes. Both are opened together, but A is turned off after some time, and the tank is full exactly 14 minutes after the start. After how many minutes was A turned off?
- 6 minutes
- 4 1/2 minutes
- 5 minutes
- 3 1/2 minutes
Answer and explanation
Answer: B. 4 1/2 minutes
Explanation: B works all 14 minutes and fills 14/20 = 7/10. A must fill the remaining 3/10 at 1/15 per minute, taking 4.5 minutes.
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