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S=255 km
t=4h i 15 min-30min=3 h i 45 min=3,75 h
V=?
V=255 km/3,75 h
V=68 km/h
4,25h -0,5 h = 3,75h
V=s/t = 225km/3,75h = 68 km/h
t= 4h 15 min = 4,25 h
s=?
v=s/t s=v*t
s=60*4,25=255 km
4h i 15 min - 30 min =3h i 45 min = 3,75 h
s= 255 km
t2=3, 75 h
v=?
v=255/3,75
v = 68 km/h
odp. jechał z predkoscią 68 km/h