Three rods of the same dimension have th...

Three rods of the same dimension have thermal conductivities 3K, 2K and K. They are arranged as shown in fig. with their ends at `100^(@)"C", 50^(@)"C and "20^(@)"C"`. The temperature of their junction is

`60^(@)"C"`

`70^(@)"C"`

`50^(@)"C"`

`35^(@)"C"`

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