A tank of water has been outdoors in cold weather, and a slab of ice 6.4 cm thick has formed on its surface (see the figure). The air above the ice is at -16C. Calculate the rate of formation of ice (in centimeters per hour) on the ice slab. Take the thermal conductivity of ice to be 0.0040 cal/s.cm.Co, its density to be 0.92 g/cm3, and its latent heat of fusion to be 333 kJ/kg. Assume no energy transfer through the tank walls or bottom. Air Ice Water Number Units