The angle of elevation of the top of a tower from a certain point is 30°. If the observer moves 40 m towards the tower, the angle of elevation of the top of the tower increases by 15°. The height of the tower is:

The angle of elevation of the top of a tower from a certain point is 3

1.	The angle of elevation of the top of a tower from a certain point is 30°. If the observer moves 40 m towards the tower, the angle of elevation of the top of the tower increases by 15°. The height of the tower is:
A.	4.2 m
B.	2.2 m
C.	2.2 m
D.	4.6 m
Answer» E.