Qwizy BINGO - Related Rates Question #20

$Solve each related rate problem. A conical paper cup is $20\,cm$ tall with a radius of $10\,cm.$ The bottom of the cup is punctured so that the water leakes out at a rate of $\frac{2\pi}{3} \,cm^{3}/sec.$ At what rate is the water level changing when the water level is $8\,cm?$$