Dances runs around a track in sixty seconds. Wolves, running in the opposite direction around the track, meets Dances every twenty seconds. How long does it take for Wolves to run around the track?
After 60 seconds, Dances has completed one lap and Wolves must have completed two laps, since they will meet for the third time. Thus, Wolves is running twice as fast as Dances. The answer is 30 seconds.
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