A boy 2 m tall is standing at some distance from a 20 m tall building. The angle of elevation from his eyes of the top of the building increases from 30° to 60° as he walks towards the building. Find the distance he walked towards the building.
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A boy 2 m tall is standing at some distance from a 20 m tall building. The angle of elevation from his eyes of the top of the building increases from 30° to 60° as he walks towards the building. Find the distance he walked towards the building.
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