A water treatment plant has a sedimentation basin of depth $3\:m$, width $5\:m$, and length $40\:m$. The water inflow rate is $500\:m^{3}/h$. The removal fraction of particles having a settling velocity of $1.0\; m/h$ is __________ (round off to one decimal place)

(Consider the particle density as $2650\; kg/m^{3}$ and liquid density as $991\; kg/m^{3})$