(1 point) Gravel is being dumped from a conveyor belt at a rate of 50 cubic feet per minute. It forms a pile in the shape of a right circular cone whose base diameter and height are always equal to each other. How fast is the height of the pile increasing when the pile is 10 . . _ 1 2 feet high?' (Recall that the volume of a right circular cone with height h and radius of the base 7' IS given by V 37W [1.)