A person travels $\frac{1}{3}$ of his journey by bus at $60\, km / h$ , $\frac{1}{3}$ by scooter at $30\, km / h$ and the rest by walking at $10 \,km / h$. Find his average speed for the whole journey. (in $km/h$)

  • A

    $30$

  • B

    $33 \frac{1}{3}$

  • C

    $20$

  • D

    $50$

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