obliczcie to.
0,05godziny - ile to minut
0.25 doby-ile to godzin
0,005godziny-ilr to sekund
0,4 godziny lekcyjnej-ile to minut
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1h=60min
0.05*60=3min
1doba=24h
0.25*24=6h
1h=3600s
0.005*3600=18s
1godz. lek. = 45min
0.4*45=18min
:)