Calculating Average Speed of a Road Trip

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To calculate the average speed of the road trip, first determine the total distance traveled during each segment of the trip. The distances for each segment are calculated by multiplying speed by time: 16.25 km for the first segment (15 min at 65 km/h), 25 km for the second segment (20 min at 75 km/h), and 40 km for the third segment (60 min at 40 km/h), totaling 81.25 km. The total time spent driving is 110 minutes, which converts to 1.833 hours when divided by 60. The average speed is then found by dividing the total distance (81.25 km) by the total time (1.833 hours), resulting in an average speed of approximately 44.4 km/h.
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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 15.0 min at 65.0 km/h, 20.0 min at 75.0 km/h and 60.0 min at 40.0 km/h, and spends 15.0 min eating lunch and buying gas.

Determine the average speed for the trip.

I know average speed is total distance/total time but I am confused as to how to get the total distance. For the total time I added 15+20+60+15 and got 110 minutes. Would displacement play a part in this problem?
 
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