A person travels by car from one city to an - other. she drives for 26.7 min at 81.7 km/h, 12.1 min at 88.3 km/h, 50.8 min at 47.2 km/h, and spends 11.8 min along the way eating lunch and buying gas. determine the average speed of the trip.

Question

Physics

Paddington

29 December, 00:12

A person travels by car from one city to an - other. she drives for 26.7 min at 81.7 km/h, 12.1 min at 88.3 km/h, 50.8 min at 47.2 km/h, and spends 11.8 min along the way eating lunch and buying gas. determine the average speed of the trip.

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Lewis · Answer 1

Total distance = (26.7/60 x 81.7) + (12.1/60 x 88.3) + (50.8/60 x 47.2) = 0.445 x 81.7 + 0.2017 x 88.3 + 0.8467 x 47.2 = 36.36 + 17.81 + 39.96 = 94.13 km

Average distance = total distance / time taken = 94.13 / (0.445 + 0.2017 + 0.8467) = 94.13/1.4934 = 63.03 km/hr