6th Grade Number Theory In Functions Counting and Itinerary Problems: Problem 3

Problem: As shown, there are three circular tracks, in which all of their circumferences are 1 kilometer. Each of the runners A, B, and C begin on the overlapping point O and go on three different tracks. Their speeds are respectively 4/3 kilometers per hour, 6/5 kilometers per hour, and 8/9 kilometers per hour. The first time they all meet each other again, how many kilometers did they run altogether?

Key: Find the hidden question in the problem.

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