In one hour the first pipe fills 1/10 of total.
In one hour the second pipe fills 1/6 of total.
One hour with both pipes turned on fills:
[tex]\frac{1}{10}+\frac{1}{6}=\frac{16}{60}=\frac{8}{30}=\frac{4}{15}[/tex]fills 4/15 on one hour, then to fully fill the pool with both pipes turned on we need:
[tex]\frac{1}{\frac{4}{15}}=\frac{15}{4}=3.75[/tex]3 hours and 45 minutes.
