wyraź w minutach 1 godzina i 25 minut, 2 godziny i 10 minut, 5 godzin i 30 minut ,1 godzina i 15 minut, 3 kwadranse, 2 godziny i 3 kwadranse, 120 sekund, 300 sekund.
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1 h 25 min - 60 + 25 min = 85 min , 2 h 10 min - 60 x 2 + 10 = 120 + 10 = 130 , 5 h 30 min - 5 x 60 + 30 = 300 + 30 = 330 , 1 h 15 min - 60 + 15 = 75 , 3 kwadranse - 3 x 15 = 45 min , 2 h i 3 kwadranse - 2 x 60 + 3 x 15 = 120 + 45 = 165 , 120 sec - 120 : 60 = 2 , 300 sekund - 300 : 60 = 5 min