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Three bodies of the same material and ha...

Three bodies of the same material and having masses m, m and 3m are at temperatures `40^(@) C 50^(@) C and 60^(@)C` respectively. If the bodies are brought in thermal contact, the final temperature will be

A

`45^(@)C`

B

`54^(@)C`

C

`52^(@)`C

D

`48^(@)C`

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