A vertical tower stand on a horizontal plane and is surmounted by a vertical flag-staff of height 5 metres. At a point on the plane, the angles of elevation of the bottom and the top of the flag-staff are respectively `30^0a n d60^0dot` Find the height of the tower.

Explanation

To solve the problem step by step, we will use trigonometric ratios to find the height of the tower.

### Given:
- Height of the flagstaff (BD) = 5 meters
- Angle of elevation to the bottom of the flagstaff (C) = 30°
- Angle of elevation to the top of the flagstaff (D) = 60°
- Let the height of the tower (AB) = H meters

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