From a point P on a level ground, the angle of elevation of the top tower is 30^{ο}. If the tower is 100 m high, the distance of point P from the foot of the tower is:

The angle of elevation of a ladder leaning against a wall is 60^{ο} and the foot of the ladder is 4.6 m away from the wall. The length of the ladder is:

A man standing at a point P is watching the top of a tower, which makes an angle of elevation of 30^{ο} with the man's eye. The man walks some distance towards the tower to watch its top and the angle of the elevation becomes 60^{ο}. What is the distance between the base of the tower and the point P?