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Sand falls from a conveyor belt at a rate of 13 m / min onto the top of a conical pile. The height of the

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Sand falls from a conveyor belt at a rate of 13 m / 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 8 m high? Answer in centimeters per minute

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