77777 7777 ,,77777 77 7- 77 7777177 Problem 4.11. Grain pouring from a chute at the rate of 8 ft3 / min forms a conical pile Whose height is always

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77777 7777 ,,77777 77 7- 77 7777177 Problem 4.11. Grain pouring from a chute at the rate of 8 ft3 / min forms a conical pile Whose heightis always twice its radius. How fast is the height of the pile increasing at the instant when the pile is 6 ft high?