# The sun is shining and a spherical snowball of volume 340 ft3 is melting at a rate of 17 cubic feet per hour. As it melts, it remains spherical. At what rate is the radius changing after 7 hours?

Now we look at our quantities to see what we need and what we have.

We plug this value in for "r" inside the derivative:

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The rate at which the radius is changing after 7 hours is approximately ( \frac{1}{20} ) feet per hour.

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