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Determine the height of a mountain if...

Determine the height of a mountain if the elevation of its top at an unknown distance from the base is `30o` and at a distance 10km further off from the mountain, along the same line, the angle of elevation is `15o` . (Use `tan15o=0. 27` )

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VK GLOBAL PUBLICATION-HEIGHT AND DISTANCE-SHORT ANSWER QUESTIONS II
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