Sally travels by car from one city to another. she drives for 30.0 min at 80.0 km/hr, 12.0 min at 105.0 km/hr, and 45.0 min at 40.0 km/hr, and she spends 15.0 min eating lunch and buying gas.
a. determine the average speed for the trip.
b. determine the total distance traveled.

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