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A pipe can fill a tank in x hours and...

A pipe can fill a tank in x hours and another pipe can empty it in `(y\ >\ x)` hours. If both the pipes are open, in how many hours will the tank be filled? `(x-y)hou r s` b. `(y-x)\ hou r s` c. `(x y)/(x-y)hou r s` d. `(x y)/(y-x)hou r s`

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