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6*45min+20min+5*10min=270min+20min+50min=340min.
340:60=5r40; 340min=5h 40min;
8:00 + 5h 40min = 13:40.
Odp.: Uczeń skończy lekcje o godzinie 13:40.
1 godzina = 60 minut = 60*60 sekund = 3600 sekund;
1 doba = 24 godziny = 24*60 minut = 1440 minut = 1440*60 sekund = 86400 sekund;
1 kwadrans = 1/4 godziny = 15 minut = 15*60 sekund = 900 sekund;
10 sekund = 1/6 minuty = 1/6*1/60 godziny = 1/360 godziny.