Răspuns :
a) 1°= 60 Min.
60min+15min=75min x 60=4500sec
4500sec+20sec=4520
b) 10 ore=600min
600min+30min=630min
630min x 60=37800sec
o ora+15min+20s=
60x60+15x60+20=
3600+900+20=4520s
10ore si 30min=
10x60x60+30x60=
36000+1800=37800 s
60x60+15x60+20=
3600+900+20=4520s
10ore si 30min=
10x60x60+30x60=
36000+1800=37800 s