4. The volume of water, V, in a spherical container of radius 1 metre is related to the water level, h, measured from the bottom on the container, as illustrated below. Height - h Volume = V The volume of water in the spherical container is given by the function V = Th2 ( 1 - 12 ) If water is flowing into the spherical container at a rate of 0.3 m /s, determine the rate at which the water level is rising when h = 0.6 m. [3 marks]