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A1.5 m tall boy is standing at some dist...

A1.5 m tall boy is standing at some distance from a 30 m tall building. The angle of elevation from his eyse to the top of the building increase from `30^(@) " to " 60^(@)` as he walks towards the building. Find the distance he walked towards the building.

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The correct Answer is:
`therefore`Distance he walked towards thew building is `19sqrt(3)m.`
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