1 22 C 3 25 C 2 26 C 4 32 C Air outside a water lake is blowing at 40 C It takes 10 hours for first two centimeter of ice layer to form over the lake Time taken to form next four centimeter of ice layer formation will be 1 20 hours 2 40 hours 3 60 hours 4 80 hours A hot solid metal ball of radius R is left for cooling artional 1
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