$0.1\,m^3$ of water at $80\,^oC$ is mixed with $0.3\,m^3$ of water at $60\,^oC$. The final temperature of the mixture is ........ $^oC$

  • A

    $65$

  • B

    $70$

  • C

    $60$

  • D

    $75$

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