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1cm - 0,5km
1cm - 0,5km
24cm - 12km
12km * 2 = 24km <-- długość ścieżki tam i z powrotem
24cm*50000=1200000cm=12km
2*12km=24km
II.obliczenie czasu
24km:18km/h=1 6/18h=60min+1/3h=60min+20min=80min=1h20min.