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Sand falls from a conveyor belt at a rate of onto the top of a conical pile. The height of the pile is always three-eighths

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

The radius is changing at what cm/min when the height is 7m.

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