Répondre :
1. a. 12.5 km = 12 500 m
457 hm = 45 700 m
0.087 km = 87 m
345 cm = 3.45 m
b. 1h30 = 5400s
254 min = 15 240s
4.5 h = 16 200s
24h = 86 400s
c. 0.0046 km
0.065 km
0.574 km
0.05421
d. 4h 15 m 1h15m 3h10m 45 m
1. a. 12.5 km = 12 500 m
457 hm = 45 700 m
0.087 km = 87 m
345 cm = 3.45 m
b. 1h30 = 5400s
254 min = 15 240s
4.5 h = 16 200s
24h = 86 400s
c. 0.0046 km
0.065 km
0.574 km
0.05421
d. 4h 15 m 1h15m 3h10m 45 m