Bonjour,
5,4km/h
5400m/3600s
5400/3600 => 1,5m/s
4m/s
0,004km/s
0,004* 3600 => 14,4km/h
320km -> 1h
1Km -> 1/320
408 -> (1*408)/ 320 =>1,275 h
0,275 *60 = 16,5
0,5 *60 = 30
=> 1h 16mn 30s
