The horizontal distance between two towers is $60 \ m$. The angle of depression of the top of the first tower as seen from the top of the second tower is $30^\circ$. If the height of the second tower is $150 \ m$,then the height of the first tower is:

  • A
    $150 - 60\sqrt{3} \ m$
  • B
    $90 \ m$
  • C
    $150 - 20\sqrt{3} \ m$
  • D
    None of these

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