question_answer

The upper \[{{\left( \frac{3}{4} \right)}^{th}}\]portion of a vertical pole subtends an angle tan \[{{\tan }^{-1}}\left( \frac{3}{5} \right)\] at a point in the horizontal plane through its foot and at a distance of 40 m from the foot. The possible height of the vertical pole is _______.

A)  80 m               

B)  60 m

C)  40 m

D)  20 m

E)  None of these