Assume that the thermal conductivity of ...

Assume that the thermal conductivity of copper is twice that of aluminium and four times that of brass. Three metal rods made of copper, aluminium and brass are each 15 cm long and 2 cm in diameter. These rods are placed end to end, with aluminium between the other two. The free ends of the copper and brass rods are maintained at `100^@C` and `0^@C` respectively. The system is allowed to reach the steady state condition. Assume there is no loss of heat anywhere.
When steady state condition is reached everywhere, which of the following statement is true?

`57^@C`

`35^@C`

`18.8^@C`

`28.5^@C`

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