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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 40.0 min at 90.0 km/h, 19.0 min at 80.0 km/h, and 40.0 min at 50.0 km/h and spends 25.0 min eating lunch and buying gas. (a) Determine the average speed for the trip. km/h (b) Determine the distance between the initial and final cities along the route. km
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Added Mon, 03 Aug '15
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(b) Distance = Velocityx Time

Total distance travelled = (90 km/h)(40/60 h) + (80 km/h)(19/60 h) + (50 km/h)(40/60 h)

= 356/3 km

Total distance travelled = 118.67 km

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(a) Average speed of trip = Total distance travelled / Total time taken

= (118.67 km)/(40/60 +19/60 +40/60 +25/60)

= 118.67/2.066

Average speed of trip = 57.42 km/h
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Added Mon, 03 Aug '15
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