Réponse :
25cm=0,25c
2) 2,0153m
3)0,0842km
1h=60min
1h=3600sec
1min=60sec
4) 3min=3*60=....
5) 1h= 3600sec
12min=12*60=720sec
1h12min=.....sec
6) 2h45min = 2*3600+45*60=....
7) 215sec= 215/3600=0,0597222...sec
8) 12min = 12/60=0,2h
9) 1,35h= 1h21min
Explications étape par étape
