Calculate the approximate pump capacity if a pump is pumping $3$ feet $(\text{'})$ of water out of a sump in $3$ minutes and $20$ seconds with an inflow of $225$ gallons per minute $($GPM$)$ and the sump dimensions are ${10}^{\text{'}}L{8}^{\text{'}}W{10}^{\text{'}}H?$

A$)307$ GPM

B$)465$ GPM

C$)607\mathrm{.}5$ GPM

D$)765$ GPM