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6s --> 54m
zamieniamy czas na sekundy
1h20min = 80min = 80*60s=4800s
dzielimy przez 6, bo mamy dane ile metrów pokonuje w czasie 6s
4800/6 = 800
końcowy wynik
800*54=43200m=43,2km
6s-54m
4800s- x m
x=(4800*54)/6 = 43200m=43,2km
v=54m/6s
v=9m/s
80min=4800s
s=?
s=v*t
s=9m/s*4800s
s=43200m
s=43,2km