$A$ pipe can fill a tank in $x$ $h$ and another pipe can empty it in $y$ $(y > x)$ $h.$ If both the pipes are open,in how many hours will the tank be filled?
- A$(x - y) \text{ h}$
- B$(y - x) \text{ h}$
- C$\frac{xy}{x - y} \text{ h}$
- D$\frac{xy}{y - x} \text{ h}$
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