Three rods of the same dimension have thermal conductivities 3 K, 2 K and K. They are arranged as...

Three rods of the same dimension have thermal conductivities 3 K, 2 K and K. They are arranged as shown in figure given below, with their ends at 100^∘C, 50^∘C and 20^∘C. The temperature of their junction is
(1) 60^∘C
(2) 70^∘C
(3) 50^∘C
(4) 35^∘C

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