Tanks \(X\) and \(Y\) contain \(500\) and \(200\) gallons of water respectively. If water is being pumped out of tank

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