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Question

ig. 9.13A straight highway leads to the foot of a tower. A man standing at the top of the towerobserves a car at an angle of depression of 30^°, which is approaching the foot of thetower with a uniform speed. Six seconds later, the angle of depression of the car is foundto be 60^°. Find the time taken by the car to reach the foot of the tower from this point.

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