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30min = 45km
10min = 15km
120 / 15 = 8
8 x 10 = 80min
x---------------120km
x90=120*60
x90=7200/:90
x=80min
80min=1h 20 min
60:30=20min
golab przelecial 120 km w ciągu 1godz 20min