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2009-11-11T16:46:47+01:00
S=400km
s1=20%*400km=80km
s2=10%*400km=40km
s3=70%*400km=280km
t1=s1/v1=80km/(60km/h)=1h 20min
t2=s2/v2=40km/(40km/h)=1h
t3=s3/v3=280km/(90km/h)=3h 6i2/3min
t=t1+t2+t3=5h 26i2/3min
vśr.=s/t=400km/5h 26i2/3min = 73i23/49 km/h