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A pool can be filled by one pipe in 8 hours and by a second pipe in 9 hours. How long will it take using both pipes to fill the​ pool?

Sagot :

Given that it would take 4 hours for first pipe to fill half, and 4.5 hours to fill half with other pipe u would then do 4+4.5=8.5, then 8.5/2=4.25