SOLUTION: Ricardo plans to use two garden hoses to fill an above-ground swimming pool in his backyard. By itself, the first hose could fill the pool in 12 hours. The second hose could fill t

Question 935518: Ricardo plans to use two garden hoses to fill an above-ground swimming pool in his backyard. By itself, the first hose could fill the pool in 12 hours. The second hose could fill the pool in 10 hours. About how many hours (t) would it take if Ricardo uses both hoses to fill the pool?
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
r = w/t
t = w/r
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rates are additive:
r = 1/12 + 1/10
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t = 1/r
t = 1(1/12 + 1/10)
t = 1(10/120 + 12/120)
t = 1(22/120)
t = 120/22
t = 5.45454545455
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answer:
about 5.5 hours
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