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2) 25 km
3) 20 minut
4) 24:8 = 3
3×7 = 21 h
5) 690÷60=11,5 h
6) 1/3 doby
7) 7×24=168
12/168= 3/42
8) 1/168 tygodnia
9) 19:53:59