Higher Level differentiation HELP PLEASE

if you have new concise project maths 4 , exercise 15.7 question 17 , can anyone please give a way of answering this q If a hemispherical bowl of radius 6 cm contains water to a depth of h cm,the volume of the water is 1/3(pi)h*(squared)(18-h). Water is poured into the bowl at a rate of 4cm cubed/s. Find the rate at which the water level is rising when the depth is 2cm

ValH— 06/10/16