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# help

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One pipe can fill a pool in 9 hours. Another pipe can fill the pool in 6 hours. How long would it take them to fill the pool if they were working together?

Apr 19, 2020

#1
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1/9+1/6=5/18 so 3.6 hours

Apr 19, 2020
#2
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$$\frac{1pool}{9hours}+\frac{1pool}{6 hours}=\frac{5pools}{18 hours} \\~\\ \frac{18hours}{5 pools}=3 \;\;hours\;\; and \;\;3/5\;\; hour \;\;per\;\;pool \\= 3hours\;and\;36 minutes\;\;per\; pool$$

coding:

\frac{1pool}{9hours}+\frac{1pool}{6 hours}=\frac{5pools}{18 hours}
\\~\\
\frac{18hours}{5 pools}=3 \;\;hours\;\; and \;\;3/5\;\; hour \;\;per\;\;pool

\\= 3hours\;and\;36 minutes\;\;per\; pool

Apr 19, 2020