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A person travels by car from one city to another with different constant speeds between pairs of cities. She drives for 45.0 min at 80.0

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A person travels by car from one city to another with different constant speeds between pairs of cities. She drives for 45.0 min at 80.0 km/h, 18.0 min at 50.0 km/h, and 35.0 min at 50.0 km/h and spends 45.0 min eating lunch and buying gas. (a) Determine the average speed for the trip

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