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Use derivative A block of ice has a square top and bottom and rectangular sides. At a certain point in time, the square top and

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Use derivative

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A block of ice has a square top and bottom and rectangular sides. At a certain point in time, the square top and bottom each have a length of 30 cm, which are decreasing at a rate of 2 cm/h. At the same time, the height of the ice block is 20 cm and decreasing at 3 cm/h. How fast is the ice melting

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