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The angle of elevation of the top of a h...

The angle of elevation of the top of a hill from a point on the horizontal planes passing through the foot of the hill is found to be `45^(@)` . After walking a distance of 80 meters towards the top , up a slope inclined at an angle of ` 30^(@)` to the horizontal plane , the angle of elevation of the top of the hill becomes `75^(@)` . Then the height of the hill ( in meters ) is _________

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