Three rods made of same material and hav...

Three rods made of same material and having the same cross-section have been joined as shown. In the figure.Each rod is of the same length. The left and right ends are kept at `0^@C and 90^@C` respectively. The temperature of the junction of the three rods will be

`45^(@)C`

`60^(@)C`

`30^(@)C`

`20^(@)C`

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