Three rods of same dimensions have therm...

Three rods of same dimensions have thermal conductivities 3K, 2k and K, with their ends at `100^@C , 50^@C and 0^@C` respectively . They re arranged as shown in the diagram . The temperature of the junction J in steady -state is

`(200)/3.^@C`

`(100)/3.^@C`

`75^@C`

`60^@C`

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