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A straight highway leads to the foot of ...

A straight highway leads to the foot of tower. Ramaiah standing at the top of the tower observes a car at an angle of depression `30^(@)`. The car is approaching the foot of the tower with a uniform speed. Six seconds later, the angle of depression of the car is found to be `60^(@)`. Find the time taken by the car to reach the foot of the tower from this point.

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