KöMaL 2005 C827
You are sitting in an aeroplane. Looking through a window 20 cm from your eye, you can see two boats in the direction of each of the lower corners of the 25 cm×40 cm window, respectively. Given that the plane is flying at an altitude of 10.3 km, and your eye is level with the horizontal bimedian of the window, determine the distance between the two boats.
Official text KöMaL. Quoted with source.
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