4. Water is flowing at a rate of 10cm ^ 3 per second into a cylindrical can of diameter 30 cm. Find the rate at which the water is rising in cm / s .
Vol = π r^2 h , but r = 15
vol = 225π h
d(vol)/dt = 225π dh/dt
10 = 225π dh/dt
dh/dt = 10/(225π) = 2/45 π cm/s