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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 to reach the foot of the tower from this point.

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OSWAAL PUBLICATION-SOME APPLICATION OF TRIGONOMETRY-TEXTBOOK CORNER EXERCISE 12.1
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