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?	Select the correct option.
A) 4 units B) 8 units C) 12 units D) Data inadequate E) None of these
Explanation:   One of AB, AD and CD must have been given.So, the data is inadequate.   Answer: Data inadequate
<result>D</result>
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?