20. Please calculate the rate of ice formation (in centimeters per hour) on the bottom of the ice slab. Take the thermal conductivity of icc to be 0.004 cal/sㆍ cm ㆍ℃, the latent heat of fusion of water to be 80 cal/g, and density of ice to be 0.92 g/cm3； here we assume no heat transfer through the tank walls or bottom.
(A) 0.55 cm/r
(B) 0.39 cm/hr
(C)0.62 cm/hr
(D)0.24cm/hr
(E) 0.12 cm/hr
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