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Mathematics, 09.10.2019 02:30 rdrboo

9. a car has an average speed of 80 km/h for one hour, then an
average speed of 90.0 km/h for two hours during a three-hour
trip. what was the average speed for the three hour trip?

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9. a car has an average speed of 80 km/h for one hour, then an
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