Aperson travels by car from one city to another with different constant speeds between pairs of cities. she drives for 30.0 min at 80.0 km/h, 45.0 min at 40 km/h and 12.0 min at 100 km/h, and spends 15.0 min eating lunch and buying gas. determine the average sped for the trip. determine the difference between the intial citties along the route.
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