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

Options

A. `25^(@)C`
B. `50^(@)C`
C. `75^(@)C`
D. `100^(@)C`

Answer

A