The pdf's arnt loading for me if you could put the answer in the comments that would be awesome

Gravel is being dumped from a conveyor belt at a rate of 30 fto/ min, and its coarseness is such that it forms a pile in the shape of a cone whose base diameter and height are always equal. How fast (in ft/min) is the height of the pile increasing when the pile is 13 ft high? (Round your answer to two decimal places.) -9.8 X ft/min Submit