A person travels by car from one city to another withdifferent constanct speeds

Question

A person travels by car from one city to another withdifferent constanct speeds between pair with cities. Shedrives for 31.1 min at 79.6 km/h, 13 min at 108.2 km/h, and 55.2min at 40.9 km/h, and spends 19.2 min eating lunch and buyinggas. Find the avg. speed for the trip. Answer in units ofkm/h. A person travels by car from one city to another withdifferent constanct speeds between pair with cities. Shedrives for 31.1 min at 79.6 km/h, 13 min at 108.2 km/h, and 55.2min at 40.9 km/h, and spends 19.2 min eating lunch and buyinggas. Find the avg. speed for the trip. Answer in units ofkm/h.

Explanation / Answer

dtotal = 79.6(31.1)/60 + 108.2(13)/60 +40.9(55.2)/60 dtotal = 102.33 km ttotal = 31.1 + 13 + 55.2 + 19.2 ttotal = 118.5 min vavg = dtotal/ttotal vavg = 102.33(60)/118.5 vavg = 51.81 km/h vavg = 102.33(60)/118.5 vavg = 51.81 km/h

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