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Two flat metal plates area placed with t...

Two flat metal plates area placed with their surfaces in contact and their outer surfaces are maintained at temperatures of `100^(@)C` and `0^(@)C` respectively. If the thicknes of the plates are `2cm` and `1cm` and their thermal conductivities are `10cal m^(-1)K^(-1)s^(-1)` and `20 cal m^(-1)K^(-1)s^(-1)` respectively, find the temperature of the surfaces in contact.

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20 degree Celsius
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