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?  Choices:
A) 5/M+K hours
B) 6(M+K) hours
C) 300/M+K hours
D) 300/M−K hours
E) 60/M−K hours
Consider k=1,m=2   Then per the question,   500 - 1x = 200 + 2x   x=100   Check answer options for No. of hours (x)=100 for k=1 and m=2   ANSWER:300/M+K hours
<result>C</result>
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?