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S - prędkość
T - czas
V = s * t
S = v : t
T = v : s
S = 60km/h
T = 4h 15min
V = 60km/h * 4h 15min
V = 255km
T = 4h 15min - 30min
T = 3h 45min
V = 255km
S = 255km : 3h 45min
S = 68km/h
Odp. Dziś jechał z prędkością 68km/h.
60km - 1h
x - 4,25h
x=60*4,25=225 km
4,25h - 0,5h = 3,75h
V=225/3,75= 68km/h
w ciagu 4 h i 15 min ( tj. 4,25h) przejedzie 4,25*60km= 255 km
w ciagu 3,75h przejechal 255km
255 / 3,75 = 68
Dzis jechal 68km/h
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