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Mathematics, 09.12.2020 01:00 cadence58

Maria left the hardware store and traveled toward the train station at an average speed of 20 mph. Joe left sometime later traveling in the same direction at an average speed of 50 mph. After traveling for two hours Joe caught up with Maria. How long did Maria travel before Joe caught up? Answer is: 5 hours
Please explain and show how it’s 5 hours.

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