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At a sand and gravel plant, sand is falling off a conveyor belt and onto a conical pile at the rate of 10 cubic feet per minute.

At a sand and gravel plant, sand is falling off a conveyor belt and onto a conical pile at the rate of 10 cubic
feet per minute. The diameter of the base of the cone is approximately three times the altitude. At what
rate is the height of the pile changing when the pile is 15 feet tall?

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