A tank fills in 6 hours with two pipes. One pipe alone fills it in 10 hours. How many hours will the other pipe alone take?
- 10
- 20
- 15
- None of these
Explanation
Combined rate = 1/6; first pipe rate = 1/10.
Second pipe rate = 1/6 - 1/10 = 1/15.
So, the second pipe alone fills in 15 hours.
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