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Sand falls from a conveyor belt at a rate of 14 m3/min onto the top of a conical pile. The height of the pile is

Sand falls from a conveyor belt at a rate of 14 m3/min onto the top of a conical pile. The height of the pile is always three-eighths of the base diameter. How fast are the height and the radius changing when the pile is 2m high? Answer in centimeters per minute.

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