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Calculati in secunde:a)3ore+15min+20s;b)35min+50s;c)200s+2ore;d)5ore-240min-3540s;e)2,5ore+30,5min

Răspuns :

a) 3ore+15min+20s= 10800s+900s+20s=11720s
b)35min+50s=2100s+50s=2150s
c)200s+2ore=200s+7200s=7400s
d) 5ore-240min-3540s=18000s-14400s-3540s=3600s-3540s=60s
e) 2,5 ore+30,5 min=9000s+2700s=11700s

10.800+900+20=11720
2100+50=2150
200+7200=9200
18000-14400-2540=1060
9000+1830=10830