Odpowiedzi

2009-09-27T13:14:32+02:00
45 min = 45/60 h = ¾ h
s=vt
s=80*¾=60 km
2009-09-27T13:16:46+02:00
80km:60min=1¹/₃km
1¹/₃km*45min=60km