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v1=80km/h t1=?
v2=90km/h t2=?
s=255km
t= s/v
t1= 255km/80km/h
t1~ 3,2 h
t2= 255km/90km/h
t2~ 2,8 h
3,2-2,8= 0,4h
Odp. Minęły się po czasie 0,4 h