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The swimming pool can be filled in 40 hours using the medium hose. With the large hose, it will take 30 hours instead. If we use both hoses (without any impact on waterflow rate), how long does it take to fill the pool? Round your answer to the nearest hour.

 
 Jan 10, 2021
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1 / ( 1/40 + 1/30) = 1 / ( 7/120) = 120/7 = ~~17 hrs

 
 Jan 10, 2021

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