Ice has formed on a shallow pond, and a steady state has been reached, with the air above the  ice at -5.0 °C and the bottom of the pond at 4.0 °C. If the total depth of ice+water is 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-°C-s, respectively.)

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