Five metallic rods of same length and sa...

Five metallic rods of same length and same material are connected as shown in the figure. One end of each is kept at temperatures `100^(@)C, 80^(@)C, 70^(@)C, 50^(@)C` and `0^(@)C` as shown respectively. The temperature at the junction of the five rods is

`70^(@)C`

`60^(@)C`

`75^(@)C`

`40^(@)C`

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