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Cîte ore contin :420min,540min,1200min,7200s,14400s,21600s?

Răspuns :

420:60=7ore
540:60=9ore
1200:60=20ore
7200:(60*2)=7200-120=60ore
14400:(60*2)=14400:120=120ore
21600:(60*2)=21600:120=180ore