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Łączny czas tam i z powrotem t = 15 + 25 = 40 min = 40/60 godziny
Prędkość średnia = s/t = 40 / 40/60 = 60 km/h
Gotowe!!!
śv(średnia prędkość )= (20km:1/4h + 20km:5/12h) :2
śv = (80km/h + 48km/h)2
śv=128km/h:2
śv= 64km/h