A closed box is filled with dry ice at a temperature of -93.7 oC, while the outside temperature is 21.5 oC. The box is cubical, measuring 0.348 m on a side, and the thickness of the walls is 4.20 × 10-2 m. In one day, 3.33 × 106 J of heat is conducted through the six walls. Find the thermal conductivity of the material from which the box is made.
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