A person covers $9\, km$ with a speed of $3 \,km / h , 25 \,km$ with a speed of $5\, km / h$ and $30\, km$ with a speed of $10\, km / h$. Find out the average speed of person in $km / h$ ?

  • A

    $5 \frac{9}{11}$

  • B

    $11 \frac{5}{9}$

  • C

    $9 \frac{5}{11}$

  • D

    $5 \frac{5}{11}$

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