Ice has formed on a shallow pond, and a steady state has been reached, with the air above the ice at – 5.0oC and the bottom of the pond at 4.0oC. If the total depth of ice + water rs 1.4 m, how thick is the ice (Assume that the thermal conductivities of ice and water are 0.40 and 0.12 cal/m ∙ Co ∙ s, respectively.)