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Given a map with scale 1:50,000, the distance on the map between two road intersections in...

Given a map with scale 1:50,000, the distance on the map between two road
intersections in flat terrain measures 50 mm. The distance between the same points is 92 mm
on a vertical photograph. It is also know that the intersections occur at an average elevation
of 381 m above mean sea level. If the camera had a focal length of 210 mm, what is the flying
height above sea level for this photo.

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