A man covers $\frac{1}{3}$ of his journey by train at $80\, km / h ,$ next $\frac{1}{3}$ by $60\, km / h$ and the rest by bicycle at $30 \,km / h$. Find the average speed of the man during the whole journey. (in $km/h$)

  • A

    $65$

  • B

    $45$

  • C

    $48$

  • D

    $53 \frac{1}{3}$

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