An additive having a viscosity of $2 \mathrm{cP}$ and a density of $50 \mathrm{lb}_{\mathrm{m}} / \mathrm{ft}^{3}$ is fed from a reservoir into a mixing tank. The pressure in both the reservoir and the tank is $1 \mathrm{~atm}$, and the level in the reservoir is $2 \mathrm{ft}$ above the end of the feed line, in the tank. The feed line consists of $10 \mathrm{ft}$ of $1 / 4 \mathrm{in}$. Sch. 40 pipe, 4 elbows, 2 plug valves, and 1 globe valve. What will the flow rate of the additive be (in gpm) when all the valves are fully open?