A slurry containing solid particles having a density of $2.4 \mathrm{~g} / \mathrm{cm}^{3}$, ranging in diameter from $0.001 \mathrm{in}$. to $0.1 \mathrm{in}$., is fed to a settling tank $10 \mathrm{ft}$ in diameter. Water is pumped into the tank at the bottom and overflows at the top, carrying some of the solid with it. If it is desired to separate out all particles of diameter $0.02 \mathrm{in}$. and smaller, what flow rate of the water in gpm is required?