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A 1.5 m tall boy is standing at some distance from a 30m tall building.

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A 1.5 m tall boy is standing at some distance from a 30m tall building. The angle of elevation from his eyes to the top of the building increases from 30º to 60º as he walks towards the building. Find the distance he walked towards the building

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Let AB be the building and PQ be the initial position of the boy (Fig. 11.26) such that

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Thanks a lot
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