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Two rods of same dimensions, but made of...

Two rods of same dimensions, but made of different materials are joined end to end to end with their free end being maintained at `100^(@)C` and `0^(@)C` respectively. The temperature of the junction is `70^(@)C`. Then the temperature of the junction if the rods are inerchanged will be equal to `T^(@)C` Find `T`:

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