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A winery has a vat with two pipes leading to it. The inlet pipe can fill the vat in 7 hours, while the outlet pipe can empty it in 9 hours. How long will it take to fill the vat if both pipes are left open?

 Oct 10, 2020
 #1
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1/7  + 1/-9 = 1/x    solve for x = 31.5 hours

 Oct 10, 2020
 #2
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[9 / (9 - 7)]  x  7 =31.5 hours to fill the Vat.

 Oct 11, 2020

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