A closed box is filled with dry ice at a temperature of -84.1 C, while the outside temperature is 28.1 .C. The box is cubical, measuring 0.374 m on a side, and the thickness of the walls is 2.87 x 102 m. In one day, 3.78 x 10 J of heat is conducted through the six walls. Find the thermal conductivity of the material from which the box is made. Number i Units