1.  A man standing at a point P is watching the top of a tower, which makes an angle of elevation of 30° 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°. What is the distance between the base of the tower and the point P?


Answer: Option D Explanation: One of AB, AD and CD must have given. So, the data is inadequate. 