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2014-09-22T19:08:23+02:00
30 mn = 0.5heures   donc  325km en 3.5 heures

325/3.5 = 92.85 km/h

2/ 1km = 1000 m   1 h = 3600sec

donc 92.85 km = 92850 m
3.5 heurs = 3.5 x 3600 =  12600 sec

92850 / 12600 = 7.37 m/s