Odpowiedzi

2009-10-12T15:43:27+02:00
S1 = 30 km
v1 = 60 km/h

t = 30km/60 km/h = 1/2 h

s2 = 70 km
t2 = 5/6 h

Vsr = sc/tc
Vsr = 100 km / 80/60 h = 100 km x 60/80h = 150km/2h = 75 km/h

Szybkosc srednia wynosi 75 km/h