We pour water into a conical container of a radius of 10 cm with a height of 36cm at a rate of 70 cm^3/s. At what velocity does the water level increase when it reaches 12 cm?
dh/dt=?
hint
the rate of volume increase, 70 = surface area * dh/dt
dh/dt=?
the rate of volume increase, 70 = surface area * dh/dt