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Sagot :

1 m= 60 sec 1h30 = 5400 s 3 h15 min = 3,25 h 1 h = 3600 s 2h30 min = 2,5 h //////////25 m/s = 90km/h 130km/h= environ 36 m/s = environ 2166 m/min

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