URGENT HELP PLS$!!!!!$ WHICH ANSWER IS BEST

For the figure shown below, the pump supplies $300$ HP to the water.

Assume a friction factor, $f=0\mathrm{.}02$ for both pipes. What is the flow in the $10-$

inch diameter pipe?

El$.=300ft.$

$L_1=1,{500}^{\text{'}}$

$L_2=1,500,$

El$.=100ft.$

$D_1={10}^{\text{'}\text{'}}$

$D_2=8^{\text{'}\text{'}}$

$2\mathrm{.}2$ cfs

$3\mathrm{.}5$ cfs

$6\mathrm{.}2$ cfs

$9\mathrm{.}7$ cfs