Related Rates, Volume of liquid change

Deathfish
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Water is emptied from a spherical tank of radius 24 ft. The water in the tank is 8 ft deep and its level is decreasing at the rate of 2 ft/ min. At this time, what is the rate of change of the radius at the top of the water?
 
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have you done any work yourself? show us what you've done and we can help you.

anyway, i would start off by finding the formula for the volume of a sphere, as well as listing down all the given information (ex. dV/dt=...)
 

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