Water at $68^{\circ} \mathrm{F}$ is pumped through a $1000 \mathrm{ft}$ length of 6 in. sch 40 pipe. The discharge end of the pipe is $100 \mathrm{ft}$ above the suction end. The pump is $90 %$ efficient, and it is driven by a $25 \mathrm{hp}$ motor. If the friction loss in the pipe is $70 \mathrm{ft} \mathrm{lb}_{\mathrm{f}} / \mathrm{lb}_{\mathrm{m}}$, what is the flow rate through the pipe in gpm? $\left(P_{\text {in }}=P_{\text {out }}=1 \mathrm{~atm}.\right)$