Explanation:

- We want to find the height of the tower. Let's call the tower's height \( h \).

- The angle of depression to the top of the 10 m building is 60°.

- Use trigonometric principles. In such a case, \( \tan(60°) = \frac{h - 10}{50\sqrt{3}} \).

- Since \( \tan(60°) = \sqrt{3} \), we have:

$$

\sqrt{3} = \frac{h - 10}{50\sqrt{3}}

$$

- Multiply both sides by \( 50\sqrt{3} \):

$$

3 \cdot 50 = h - 10

$$

$$

150 = h - 10

$$

- Add 10 to both sides:

$$

h = 160

$$

- Correct Option: 3 - 160 m