To a person, going eastward in a car with a velocity of $25\, km/hr$, a train appears to move towards north with a velocity of $25\sqrt 3 $ $km/hr$. The actual velocity of the train will be..........$km/hr$

  • A

    $50$

  • B

    $25$

  • C

    $5$

  • D

    $5\sqrt 3 $

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