Water at 50∘C is filled in a cubical container of side 1 m. The thickness of the walls of the container is 1 mm. The container is surrounded by large amount of ice at 0∘C. The temperature of the water becomes 25∘C in 10 ln2 seconds. Choose the correct options.
[Given, specific heat of water =1 cal/(gm∘C); latent heat of fusion of ice =80 cal/gm; density of water =1gm/cm3; heat capacity of the container =1 J/K]