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t1=1h
s2=42km
t2=3h
V=?
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s=s1+s2=26km+42km=68km
t=t1+t2=1h+3h=4h
V=s/t=68km/4h=17km/h
v=s/t [km/h]
s=26+42=68 km
t= 1+ 3 = 4h
v=68/4=17 km/h
Odp. Prędkość średnia wynosi 17 km/h.