A man is walking towards a vertical pillar in a straight path, at a uniform speed. At a certain point A on…
A man is walking towards a vertical pillar in a straight path, at a uniform speed. At a certain point on the path, he observes that the angle of elevation of the top of the pillar is . After walking for minutes from in the same direction, at a point , he observes that the angle of elevation of the top of the pillar is . Then the time taken (in minutes) by him, from to reach the pillar, is