The interior wall of a large, commercial walk-in type meat freezer is covered under normal operating conditions with a 2-cm thick layer of ice. One day, a power outage cuts electricity to the refrigeration system of the freezer. Estimate the time required to melt this layer of ice if it has a mass density of 700 kg/m³ and a latent heat of fusion of 334 kJ/kg. Consider the air temperature inside the freezer to be 20°C with a heat transfer coefficient of 2 W/m²K for convection from the freezer surface to air, and clearly state the assumptions made in your calculations.