Question

Calculati:
4 h 30 min + 2 h 54 min
2 h 3 min 15 s + 7 h 58 min 34 s

21 h 20 min - 17 h 37 min
5 h 5 min 12 s - 2 h 12 min 30 s
VA ROGG

Answer 1

4*60+30+2*60+54=444 minute sau 26.640 secunde

2*60+3+7*60+58 (secundele la urma)=601 minute 49 s =36.060 s + 49 s = 36.109 s

21*60+20-17*60+37=230 minute=13.800 secunde

5*60+5=305min*60=18.300s+12s=18.312s;
18.312-(2*60*60)+12*60+30=18.312-7920=10.362 s