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Meilleure réponse !
2013-04-06T16:18:40+02:00

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