An air-traffic controller observes two aircraft on his radar screen. The first is at altitude 950 m, horizontal distance 19.9 km, and 23.5° south of west. The second aircraft is at altitude 1200 m, horizontal distance 17.4 km, and 22.0° south of west. What is the distance between the two aircraft? (Place the x axis west, the y axis south, and the z axis vertical.)
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