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