bonjour
1 ) 2 .875 km = 2 875 m
2 875 : 12.5 = 230
il met 230 s
230 s = 3 min 50 s
3 jours = 24 x 3 x 3 600 = 259 200
3 jours = 259 200 s
distance = temps x vitesse
259 200 x 300 000 = 7.776 x 10 ¹⁰ km
250 s = 76 km
1 s = 0.304 km
0.304 km /s = 304 m / s
304 m /s = 0.304 x 3 600 = 1 094.4 km / h
bonne journée