SOLUTION: One pipe fills a pool in 6 hours . A second pipe can fill the same pool in 4 hours, how long would it take to fill the pool if both pipes were working?

Question 141034: One pipe fills a pool in 6 hours . A second pipe can fill the same pool in 4 hours, how long would it take to fill the pool if both pipes were working?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
One pipe fills a pool in 6 hours . A second pipe can fill the same pool in 4 hours, how long would it take to fill the pool if both pipes were working?
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1st pipe DATA:
Time = 6 hrs/job ; Rate = 1/6 job/hr.
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2nd pipe DATA:
Time = 4 hrs/job ; Rate = 1/4 job/hr.
--------------------------------
Together DATA
Time = x hrs/job ; Rate = 1/x job/hr
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EQUATION:
rate + rate = together rate
1/6 + 1/4 = 1/x
2x + 3x = 12
5x = 12
x = 2.4 hrs (time to fill the pool using both pipes)
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Cheers,
Stan H.
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