The volume, V, of a cylinder of radius r and height h is given by the formula, V=Pi *(r^2) *h.

Tomato soup is leaking out the bottom of a cylindrical can of diameter 10cm at a rate of Pi cm^3/sec. How quickly is the surface of the soup falling.

How do you solve this question? I have tried differentiating V but the Pi confuses me. Please help.

Thanks.