Qwizy BINGO - Related Rates Question #46

$Solve each related rate problem. A conical paper cup is $10\,cm$ tall with a radius of $10\,cm.$ The bottom of the cup is punctured so that the water leakes out at a rate of $\frac{9\pi}{4} \,cm^{3}/sec.$ At what rate is the water level changing when the water level is $7\,cm?$$