I got a lot of this problem like this. Let me know how much you charge per probl

I got a lot of this problem like this. Let me know how much you charge per problem like the problem below?
 A large ice cube is melting, each edge shrinking by 2 centimeters per minute. Find the rate at which the volume is changing at the moment when the length of each edge is 15 cm. Assume the cube maintains its shape throughout the melting process.