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Calculus question

Hey, basically I'm finishing an assignment and I kinda need help with my last question.
Here it is:
A snowball is melting at a rate of 0.1m^3h^-1. Find the rate of decrease of the radius in cm per hour when the radius is 50 cm. Assume the snowball is spherical.
dr/dt = dr/dv*dv/dt

you are told dv/dt

to find dr/dv you need to consider dv/dr : since it is a spherical snowball you can differentiate the well known formula connecting V and r.

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