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Gravel is being dumped from a conveyor belt at a rate of 20 ft3/min.


Gravel is being dumped from a conveyor belt at a rate of 20 ft3/min. It forms a pile in the shape of a right circular cone whose base diameter and height are always the same. How fast is the height of the pile increasing when the pile is 16 ft high? 


The height is increasing at _______ ft/min.

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