Volume of a sphere: $\displaystyle \frac{4}{3}\pi r^{3}$A snowball melts in volume @ 1 cm³/min. At what rate is the diameter decreasing when the diameter is 10 cm?

Volume of a sphere in terms of diameter: $\displaystyle \frac{\pi d^{3}}{6}$

Rate of volume: $\displaystyle \frac{d}{d(time)}volume = -1 cm^{3}/min.$

Rate of diameter: $\displaystyle \frac{d}{d(time)}10 cm = ?$

I'm not sure what to do at this point