A perfect reversed heat engine is used for making ice at \(-5^{\circ} \mathrm{C}\) from water available at \(25^{\circ} \mathrm{C}\). The temperature of the freezing mixture is \(-10^{\circ} \mathrm{C}\). Calculate the quantity of ice formed per kwh. For ice specific heat \(=2.1 \mathrm{~kJ} / \mathrm{kg}^{\circ} \mathrm{k}\) and latent heat \(=335 \mathrm{~kJ} / \mathrm{kg}\).