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Ten small planes are flying at a speed o...

Ten small planes are flying at a speed of 150km/h in total darkness in an air space that is `20xx20xx1.5 km^3` in volume. You are in one of the planes, flying at random within this space with no way of knowing where the other planes are. On the average about how long a time will elapse between near collision with your plane. Assume for this rough computation that a safety region around the plane can be approximated by a sphere of radius 10m.

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