Applied Hydraulics #$5\mathrm{.}1\mathrm{.}2.$

Determine the flow rate of a water pump that overcomes an energy head of $65ft.$ A $750-kW$ motor drives the pump with an efficiency of $77\%$ and the pump operates with an efficiency of $85\%.($Note: $1kW=1\mathrm{.}34$ horsepower $($hp$)$ and $1hp=550ft-l\frac{b}{s})$