One end of a 0.25 m long metal bar is in steam and the other is in contact with ice . If 12 g of ice melts per minute, what is the thermal conductivity of the metal? Given cross-section of the bar `=5xx10^(-4) m^(2)` and latent heat of ice is `80 cal g^(-1)`

Options

A. 80 cal/s-m-`""^(@)C`
B. 90 cal/s-m-`""^(@)C`
C. 70 cal /s-m-`""^(@)C`
D. 60 cal/s-m-`""^(@)C`

Answer

A