word problem related rates

Question 3 1 pts At a sand and gravel plant, sand is falling off a conveyor and onto a conical pile at a rate of 10 cubic feet per minute. The diameter of the base of the cone is approximately three times its height. At what rate is the height of the pile changing when the pile is 15 feet high? The volume of a cone is V = Arh O 0.006 ft/min O 0.094 ft/min 0.014 ft/min O 0.002 ft/min