How would i set up the equation?

Question

A spherical snowball is melting in such a way that its radius is decreasing at a rate of 0.2 cm/min. At what rate is the volume of the snowball decreasing when the radius is 15 cm. (Note the answer is a positive number).

Answer 1

Volume of Sphere = 4/3 πr³

Find dV/dr which is rate of change of Volume with respect to the change in the radius.

See if you can get the answer from there. Post your answer and we can check it.