A pond has an ice layer of thickness 3 c...

A pond has an ice layer of thickness 3 cm. If K of ice is 0.005 CGS units, surface temperature of surroundings is `-20^(@)C`, density of ice is 0.9 gm/cc, the time taken for the thickness to increase by 1 cm is

30 min.

35 min.

42 min.

60 min.

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