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calculati in sec
260s+15min+3h-14min=.......
4h+15min+30s-2h+25min+15 s
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Răspuns :

260s+15min+3h-14min=260s+900s+7200s-840s=8360-840=7520s
4h+15min+30s-2h+25min+15s=
14400s+900s+30s-7200s+1500s+15s=16845s-7200s=9645s
sucees

1 h=60 min=3600 sec.
1 min=60 sec
260 sec+900sec+10800sec-840sec=11120 sec
14400sec+900sec+30sec-7200sec+1500sec+15sec=9645 sec