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1. A pipe can fill a tank in x hours and another can empty it in y hours. In how many hours they together fill it in ( y > x) ?

A. (x - y) hours

B. (y - x) hours

C. $(\frac{x y}{x - y}) hours$

D. $(\frac{x y}{y - x}) hours$

Solution:

Time will be taken by both of them to fill the tank

= \frac{x y}{y - x}

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