Pipes & Cisterns · Question 9 · Medium
One pipe fills a tank three times as fast as another. Together they fill it in 9 hours. How long will the slower pipe take alone?
- 27 hours
- 36 hours
- 18 hours
- 12 hours
Answer and explanation
Answer: B. 36 hours
Explanation: If the slower rate is x, then x + 3x = 1/9, so x = 1/36. The slower pipe needs 36 hours.
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