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A straight highway leads to the foot of ...

A straight highway leads to the foot of a tower. A man standing at the top of the tower observes a car at an angle of depression of `30^(@)`, which 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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