Odpowiedzi

2010-01-14T15:08:21+01:00
T1 = 1 h
s1 = 10 km
t2 = 1h
s2 = 5 km
s = s1+s2 = 15 km (całkowita droga)
t = t1+t2 = 2 h (całkowity czas)
V sr = s/t

Vsr = 15 km/2 h = 7,5 km/h