Problem 1208
Amy and Ben start at the same spot on a 400 m circular track. Amy runs counterclockwise at an average pace of 6 minutes per 4 laps while Ben runs clockwise at an average pace of 7 minutes per 4 laps. In 21 minutes of running how many times do they pass each other? Do not count the instant when they start.
Problem submitted by Mike Schieffer, Austin, TX
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