Three rods of same length and area of cr...

Three rods of same length and area of cross-section but of thermal conductivities K, 2K and 3K are connected in series in the same order. Free end of the first rod is at `0^(@)C` and free end of third rod is at `55^(@)C`. In steady state, temperature difference across the middle rod is

`15^(@)C`

`30^(@)C`

`10^(@)C`

`25^(@)C`

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