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Two rectangular blocks A and B of differ...

Two rectangular blocks A and B of different metals have same length and same area of cross-section. They are kept in such a way that their cross-sectional area touch each other. The temperature at one end of A is `100^(@)C` and B at the other end is `0^(@)C`. If the ratio of their thermal conductivity is `1 : 3`, then under steady state, the temperature of the junction in contact will be

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