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A slab of stone of area 0.36 m2 and thic...

A slab of stone of area 0.36 m2 and thickness 0.1m is exposed on the lower surface to steam at `100^(@)C`. A block of ice at `0^(@)C` rests on the upper surface of the slab. In one hour 4.8 kg of ice is melted. The thermal conductivity of slab is-

A

`1.24 J//m//s//"^(@)C`

B

`1.29 J//m//s//"^(@)C`

C

`2.05 J//m//s//"^(@)C`

D

`1.02 J//m//s//"^(@)C`

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