September 2018 1 74 Report
Statek plynacy z pradem rzeki pokonuje odleglosc 104 km miedzy przystankami A i B w ciagu 8 godzin zas plynac pod prad te sama odleglosc pokonuje w ciagu 13 godzin oblicz predkosc wlasna statku i predkosc pradu rzeki
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