posted by Erica--help! .
A Styrofoam box has a surface area of 0.75 m2 and a wall thickness of 2.0 cm. The temperature of the inner surface is 5.0°C, and the outside temperature is 24°C. If it takes 7.6 h for 5.0 kg of ice to melt in the container, determine the thermal conductivity of the Styrofoam.