Răspuns :
2 ore+10 min+30 s=
=120 min+600s+30s=
=7200s+600s+30s=7830s
=120 min+600s+30s=
=7200s+600s+30s=7830s
1h=60min
1min.=60sec
10min=600 sec. (60x10)
60min=3600sec (60x60)
2h=7200 sec (3600x2)
2h+10min+30sec=
7200sec+600sec+30sec=7830 sec
1min.=60sec
10min=600 sec. (60x10)
60min=3600sec (60x60)
2h=7200 sec (3600x2)
2h+10min+30sec=
7200sec+600sec+30sec=7830 sec