GCF and LCM Mixed Problems: Problem 4

Problem: A, B, and C are traveling along a circular track. A travels 80 meters per minute, B travels 120 meters per minute, and C travels 70 meters per minute. If the entire track measures 400 meters, and they start towards the same direction, at the same time, at the same point, how many minutes will it take for them to arrive at the starting point at the same time?

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