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Omni-MATH / Alain and Louise are driving on a circular track with radius 25 km. Alain leaves…

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problem

Alain and Louise are driving on a circular track with radius 25 km. Alain leaves the starting line first, going clockwise at 80 km/h. Fifteen minutes later, Louise leaves the same starting line, going counterclockwise at 100 km/h. For how many hours will Louise have been driving when they pass each other for the fourth time?

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