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V₁ = 12 km/h
s₂ = 4 km
V₂ = 6 km/h
Vśr = ?
jeżeli ma to byc na poziomie gimnazjum to można dodać prostsze rozwiązanie:
t₁ = s₁/V₁
t₁ = 6 km/12 km/h = 0,5 h
t₂ = 4 km/6 km/h = 0,67 h
Vsr = 6 km + 4 km / 0,5 h + 0,67 h
Vsr = 10 km /1,17 h ≈ 8,55 km/h = 8,6 km/h