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. $$\left( {\frac{{xy}}{{x - y}}} \right)\,{\text{hours}}$$

D. $$\left( {\frac{{xy}}{{y - x}}} \right){\text{hours}}$$

Answer: Option D

Solution (By Examveda Team)

Time will be taken by both of them to fill the tank
$${\text{ = }}\frac{{xy}}{{y - x}}$$