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A 1.5m tall boy is standing at some dist...

A 1.5m 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 `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:
The distance walked by the boy is `19 sqrt( 3 ) `m
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SUBHASH PUBLICATION-SOME APPLICATIONS OF TRIGONOMETRY -EXERCISE 9.1
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