Odpowiedzi

2010-04-14T21:07:00+02:00
S₁ = V₁t₁ = 60 km/h * 1/4h = 15km

Sc = S₁+S₂+S₃ = 15 km + 0 km + 90 km = 105 km
tc = t₁+t₂+t₃ = 1/4 h + 3/4 h + 1h = 2h

Vśr = Sc/tc = 105 km / 2 h = 52,5 km/h
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