Răspuns:
a) 2ore 30s = 2 x 3600 + 30 = 7200 +30 = 7230 secunde
b) 15 m/s = 15 m/s x 3600 s /h = 54000 m/h = 54 km/h
c)2,7 g/cm^3 = 2,7 x 1000000 = 2700000 g /m³ = 2700 kg /m³
d)20 min + 1 ora + 236 s = 20 x 60 + 1 x 3600 + 236 = 1200 + 3600 + 236 = 5036 secunde
e) 1km+10dm+1cm+100hm+120m= 1 000 m + 1 m + 0,01 m + 10000 m + 120 m = 11 121,01 m
f) 27 °C= 273 + 27 = 300 kelvin
