Question: 13. Sand is falling from a conveyor at a rate of 28 ft3fmin onto the top of a conical pile. The height of the pile

13. Sand is falling from a conveyor at a rate of

13. Sand is falling from a conveyor at a rate of 28 ft3fmin onto the top of a conical pile. The height of the pile is always % of the base diameter. How fast is the height changing when the pile is 12 feet high

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