Working together, 7 identical pumps can empty a pool in 6 hours. How many hours will it take 3 pumps to empty the same pool?
Choose the correct answer:	A) 11	B) 13	C) 12	D) 14	E) 10
Answer:	The answer is D   7 pumps take 6 hours. 1 Pump will take 6*7 hours . Hence 3 pumps will take   (6*7)/3= 
<gadget id="calculator">  (6*7)/3</gadget>
<output>14</output>
14 hours
<result>D</result>
Working together, 7 identical pumps can empty a pool in 6 hours. How many hours will it take 3 pumps to empty the same pool?