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transformați 15 min+1h +15 s=?s​

Răspuns :

15*60+60*60+15=900+3600+15=4515s

15 min + 1 h + 15 s =

15 × 60 s + 60 × 60 s + 15 s =

900 s + 3600 s + 15 s =

4500 s + 15 s = 4515 s