You need to find and , then multiply them to get that you need. Answer is
This is the question:
A cone has height 6 cm. The radius of the base of the cone is increasing at 5cm/s. Find the rate of change of the volume of the cone when the radius of the base is 4cm.
I have already worked out that the current volume of the cone is equal to 32 pi but i dont know where to go from here.
Thanks in advance to anyone that helps!