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A styrofoam cooler is in the shape of a rectangular box. Its interior dimensions are 30×40×60 cm. Its walls are 1.5 cm thick. It contains 4.0 kg of ice with the remaining space ?lled with water. The ice and water are in thermal equilibrium. The outside temperature is 25oC, the coeffcient of heat transfer for styrofoam is 0.023 W/m·K, and the latent heat of fusion for ice is 330 kJ/kg. How long will it take for all the ice to melt?

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