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20min-xkm
x=20minutx20km dzielone na 60minut=6 2/3km=6,66(6)km
czas ---> 20minut
1h ---> 60minut
20minut --> ⅓h
20 × ⅓= 6,666...km
Rowerzysta w czasie 20 minut pokona 6,66(6)km