Out of the two cars $A$ and $B$, car $A$ is moving towards east with a velocity of $10 \,m / s$ whereas $B$ is moving towards north with a velocity $20 \,m / s$, then velocity of A w.r.t. $B$ is ......... $m / s$ (nearly)

  • A

    $30$

  • B

    $10$

  • C

    $22$

  • D

    $42$

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