Tanks \(X\) and \(Y\) contain \(500\) and \(200\) gallons of water respectively. If water is being pumped out of tank \(X\) at a rate of \(K\) gallons per minute and water is being added to tank \(Y\) at a rate of \(M\) gallons per minute, how many hours will elapse before the two tanks contain equal amounts of water?

A. \(\dfrac5{M+K}\) hours.

B. \(6(M+K)\) hours.

C. \(\dfrac{300}{M+K}\) hours.

D. \(\dfrac{300}{M-K}\) hours.

E. \(\dfrac{60}{M-K}\) hours

Answer: A

Source: GMAT Club Tests