The volume of a cone of radius r and height h is given by v=1/3*pi*r^2*h. If the radius and height both increase at a constant rate of 2 cm per second, at which rate in cubic centimeters per second is the volume increasing when the height is 8 cm and the radius is 6 cm.

I'm kinda puzzled by this problem. Should I do the product rule with the 1/3*pi*r^2*h part? Thanks a lot.