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A bar of gold is in thermal contact with a bar of silver of the same...

  1. A bar of gold is in thermal contact with a bar of silver of the same length and area as shown in fig 2. One end of the compound bar is maintained at 80.0°C while the opposite end is at 30.0°C. When the energy transfer reaches steady state, what is the temperature at the junction?   

****** I HAVE THE SOLUTION BUT I WANT TO KNOW HOW THEY DETERMINE THE FINAL AND INITIAL TEMPERATURE *******

why they choose ( 80 - T ) & (T-30 ) instead of doing opposite ? can ypu explain ? I mean not doing like ( T-80 ) (30-T ) or changing one of them only ?

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