zadanie 3
54km/h=15m/sek 72km/h=20m/sek a) 700m : (20m/sek -15m/sek) = 700m : 5m/sek= 140sek b) 700m : (20m/sek +15m/sek)= 700m : 35m/sek=20 sek
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54km/h=15m/sek
72km/h=20m/sek
a)
700m : (20m/sek -15m/sek) = 700m : 5m/sek= 140sek
b)
700m : (20m/sek +15m/sek)= 700m : 35m/sek=20 sek