The angle of elevation of the top of a tower from a certain point is `30^o` . If the observer moves 20 m towards the tower, the angle of elevation of the top of the tower increases by `15^o` . Then height of the tower is

Explanation

To solve the problem step-by-step, we will use trigonometric concepts related to angles of elevation and right triangles.

### Step-by-Step Solution:

1. **Understanding the Problem**:
- Let the height of the tower be \( h \) meters.
- Let the distance from the observer to the base of the tower initially be \( x \) meters.
- The angle of elevation from this point is \( 30^\circ \).
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