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A pipe can fill a tank in x hours and another can empty it in y hours. They can together fill it in (y > x)?

(x - y) hours
(y - x ) hours
xy / (x - y) hours
xy / ( y - x) hours

Correct Answer: xy / ( y - x) hours

Explanation:

Net filling in 1 hour = (1/x - 1/y) = (y - x) / xy
∴ Time taken to fill the tank = xy / (y - x) hrs.

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