Arithmatical - Heights and Distance

DIRECTIONS : Problems based on Heights and Distance.
6. 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?
  A.   4√3 units
  B.   8 units
  C.  12 units
  D.  Data inadequate
One of AB, AD and CD must have been given.So, the data is inadequate.
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