Question

A straight highway leads to the foot of a tower, A man standing on the top of a the tower observe c 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 form this point.

Answer 1

As, speed of the car from A to B = AB/6 = x/6 units / sec

So, the time taken to reach the foot of the tower i.e. Q from B = BQ/ speed

So, the time taken to reach the foot of the tower from the given point is 3 seconds.