Odpowiedzi

2010-03-23T20:53:24+01:00
S1=5km
t1=15min=0,25h
s2=25km
t2=30min=0,5h
V=?
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s=s1+s2=5km+25km=30km
t=t1+t2=0,25h+0,5h=0,75h
V=s/t=30km/0,75h=40km/h