An ice cube of dimensions 60 cm × 50 cm × 20 cm is placed in an insulation box of wall thickness 1 cm. The box keeping the ice cube at 0^° C of…

An ice cube of dimensions $\displaystyle 60 \mathrm{~cm} \times 50 \mathrm{~cm} \times 20 \mathrm{~cm}$ is placed in an insulation box of wall thickness $\displaystyle 1$ cm. The box keeping the ice cube at $\displaystyle 0^{\circ} \mathrm{C}$ of temperature is brought to a room of temperature $\displaystyle 40^{\circ} \mathrm{C}$. The rate of melting of ice is approximately : (Latent heat of fusion of ice is $\displaystyle 3.4 \times 10^5 \mathrm{~J} \mathrm{~kg}^{-1}$ and thermal conducting of insulation wall is $\displaystyle 0.05 \mathrm{Wm}^{-1}{ }^{\circ} \mathrm{C}^{-1}$ )