SOLUTION: A pump can fill a pool in 12 hours, and a second pump can fill the same pool in 6 hours. How long will it take to fill the pool if both pumps are used

Question 954808: A pump can fill a pool in 12 hours, and a second pump can fill the same pool in 6 hours. How long will it take to fill the pool if both pumps are used
Answer by macston(5194) (Show Source): You can put this solution on YOUR website!
Pump 1 fills: 1 pool/12 hours=1/12 pool per hour
Pump 2 fills: 1 pool/6 hours=1/6 pool per hour
1/6 pool/hr(2/2)=2/12 pool/hr
Together: 2/12 pool/hr + 1/12 pool/hr=3/12 pool/hr=1/4 pool/hr
to fill 1 pool: 1 pool/(1/4 pool/hr)= 4 hours
ANSWER: It will take 4 hours to fill the pool with both pumps.
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