12. Soybeans, pouring down from a chute at a constant rate of 2 m/min, form a conical hill. Assuming that the height of the hill is always twice the radius of its base, find the rate at which the height is increasing at the moment the height is 1 m, and also when the height is 4 m. Hint: The volume of a cone of radius r and height h is V=

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