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x-1km
7 1/2x=2h/:7 1/2
x=2/1h : 15/2
x=2/1h * 2/15
x=4/15h
4/15*60min=16min
odp.przejście 1km zajmie 4/15h(16minut)
Ania 1 km przjdzie w ciągu 4/15 godziny co stanowi 16 minut.