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A 1.5 m tall boy is looking at the top o...

A 1.5 m tall boy is looking at the top of a temple which is 30 m in height from a poin at certain distance. The angle of elevation from his eye to the top of the crown of the temple increases from `30^(@)" to "60^(@)` as he walks towards the temple. Find the distance he walked towards the temple.

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