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** Q 3071712626. ** 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 ^{ \circ }`, 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 ^{ \circ }`. Find the time taken by the car to reach the foot of the tower from this point.