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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By using trigonometric ratios
30√3 + 30÷√3 = 30 (√3 + 1 ÷√3)
30(4÷√3)
=40√3
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