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v1 = 80km/h
t1 = 1h i 45 min = 1,75h
s=?
v2=?
t2 = 2h
v=s/t
s1=v1*t1
s = 80km/h*1,75h=140km
v2=s/t2
v2 = 140km/2h = 70km/h
odp. 70km/h