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The icebox on a sailboat measures 60 cm X 60 cm X 60 cm. The contents of this icebox are to be kept at a temperature of 0°C for 4 days by the gradual melting of a block of ice of 20 kg, while the temperature of the outside of the box is 30°C. What minimum thickness of styrofoam insulation is required for the walls of the icebox?

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