Bonjour,
1) 25 cm = 0,25 m
2) 2 015,3 mm = 20,153 m
3) 84,2 m = 0,00842 km
4) 3 m = 180 sec
1 min = 60 sec donc 60 x 3 = 180
5) 1 h 12 min = 4 320 sec
1 min = 60 sec donc 12 x 60 = 720 sec et 1 h = 3 600 sec ; 720 + 3 600 = 4 320 sec.
6) 2 h 45 = 2,75 h
45 : 60 = 0,75 h
7) 215 sec = 0,05972 h
215 : 3 600 = 0,05972222...
8) 12 min = 0,2 h
12 : 60 = 0,2 h
9) 1,35 h = 1 h 21 min
0,35 x 60 = 21 min
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Bonjour,
1) 25 cm = 0,25 m
2) 2 015,3 mm = 20,153 m
3) 84,2 m = 0,00842 km
4) 3 m = 180 sec
1 min = 60 sec donc 60 x 3 = 180
5) 1 h 12 min = 4 320 sec
1 min = 60 sec donc 12 x 60 = 720 sec et 1 h = 3 600 sec ; 720 + 3 600 = 4 320 sec.
6) 2 h 45 = 2,75 h
45 : 60 = 0,75 h
7) 215 sec = 0,05972 h
215 : 3 600 = 0,05972222...
8) 12 min = 0,2 h
12 : 60 = 0,2 h
9) 1,35 h = 1 h 21 min
0,35 x 60 = 21 min