An ice box used for keeping eatables cool has a total wall area of 1 m2 and a wall thickness of 5.0 cm. The thermal conductivity of the ice box is K=0.01J/m∘C. It is filled with large amount of ice at 0oC along with eatables on a day when the temperature is 30oC. The latent heat of fusion of ice is 334×103J/kg. The amount of ice melted in one day is (1 day = 86,400 s)