Proszę o szybkie rozwiązanie, to naprawdę ważne!
zadania w linkach:
http://img87.imageshack.us/i/59293058.jpg/
http://img443.imageshack.us/i/11999263.jpg/
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vśr = Sc / tc
vśr = 120 km / 4 h
vś = 30 km/h