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A person travels by car from one city to another. She drives for 34.8 min at 72.3 km/h, 8.04 min at 85.2 km/h, 47.8 min at 35.2 km/h, and spends 11.9 min along the way eating lunch and buying gas. Determine the distance between the cities along this route. Answer in units of km.

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Below is the solution:

Distance is the sum of: 40 km (.5*80), 20 (.2*100), and 30 (.75*40).
Distance equals 40 + 20 + 30 = 90 km Total distance = 90 km.
Total time (including lunch break) is 1/2 hr + 1/5 hr +3/4 hr or .5 + .2 + .75 = 1.45 hrs

Average speed for trip: 90/1.45 =62.07 km/kr

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