A conical salt spreader is spreading salt at a rate of 1 cubic feet per minute. The diameter of the base of the cone is 4 feet and the height of the cone is 5 feet. How fast is the height of the salt in the spreader decreasing when the height of the salt in the spreader (measured from the vertex of the cone upward) is 3 feet? Give your answer in feet per minute.

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I understand the first part, but confused about the second.

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you want dh/dt so replace the r in the volume equation in terms of h.

take V' with r replaced in terms of h in the volume equation...

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