The walls of an ice chest are made of 2.00-mm-thick insulation having a thermal conductivity 0.00300 W/mK. The total surface area of the ice chest is 1.20 m2. If 4.00 kg of ice at 0.00C are placed in the chest and the temperature of the outside surface of the chest is 20.0C, how long does it take the ice to melt under steady state conditions? The latent heat of fusion of water is 334 kJ/kg.