22. Exercise problems XV

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.

 

Required time \(=\) \(sec\)