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1godz - 90 km
60 min - 90 km
90 :60 = 1,5 km
1 min - 1,5 km
120 :1,5 = 80
80 min - 120 km
1 godz 20 min - 120 km
Gołąb pokona 120 km w czasie 1 godz 20 minut.
120 km = 90 + 30
60 : 3 = 20 min
60+20=80
gołąb przeleci 120 km w 80 min