In a marathon, Alex and Rob finish one lap around the track in 8 minutes and 12 minutes, respectively. How much time will it take to meet them again at the starting point?

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In a marathon, Alex and Rob finish one lap around the track in 8 minutes and 12 minutes, respectively. How much time will it take to meet them again at the starting point?​

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In a marathon, Alex and Rob finish one lap around the track in 8 minutes and 12 minutes, respectively. How much time will it take to meet them again at the starting point?