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v = 36 km /h = 36000/3600= 10 m/s
t = 3/4 min = 0,75 * 60s = 45 s
v = s/t => 10 = s/45 => s = 450 m
zad. 2
v = 4 km / h
s = 10 km
v = s/t
4 = 10 / t
t = 2,5 h