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Three rods of the same dimensions have t...

Three rods of the same dimensions have thermal conductivities `3`k , `2`k and k . They are arranged as shown, with their ends at `100^(@)C, 50^(@)C` and `0^(@)C`. The temperature of their junction is :-

A

`75^(@)C`

B

`(200)/(3)"^(@)C`

C

`40^(@)C`

D

`(100)/(3)'^(@)C`

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