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30min= 18km/3=6km
1h = 6km*2=12km
1h - 12km
ODP: C) 12 km/h
wzor na droge
s = vt
z tego
v = s/t
dane
s = 18km
t = 1h 30min = 1,5h
v = ?
v = 18km : 1,5h = 12km/h
Pani Krystyna jechalaze srednia predkoscia 12 km/h.
czyli poprawna jest odpowiedz C.