Two motorcyclists start simultaneously in the same direction from two diametrically opposed points on a circular track, continued in detail

Answer from: Roman Canadian:
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If in one direction (clockwise or counterclockwise), just divide 20 by 25 = 0.8 hours (or 48 minutes). Reason: the distance between diametrical points is 20 km. Т. е. between the two motorcyclists is 20 kilometres. If they were both traveling at the same speed, the distance would not change, but the difference in speeds between them would change.

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