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A ‘thermacole’ icebox is a cheap and eff...

A ‘thermacole’ icebox is a cheap and efficient method for storing small quantities of cooked food in summer in particular. A cubical icebox of side 30 cm has a thickness of 5.0 cm. if 4.0 kg of ice is put in the box, estimate the amount of-ice remaining after 6 h. The outside temperature is `45 ^@C`, and co-efficient of thermal conductivity of thermacole is 0.01 J` s^-1.m-^1 K-^1`. [Heat of fusion of water =` 335 x 103 J kg^-1`

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