An ice box used for keeping eatable cold has a total wall area of $1metr{e}^2$ and a wall thickness of 5.0 cm. The thermal conductivity of the ice box is $K=0.01joule/metre{-}^{\circ }C$. It is filled with ice at $0^{\circ }$ along with eatables on a day when the temperature is ${30}^{\circ }$. The latent heat of fusion of ice is $334\times {10}^{3}joules/kg$ . The amount of ice melted in one day is
(1 day =86,400 seconds )