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Sagot :

54 secondes = 54/3600 = 0,015 heures
24 minutes = 24/60 = 0,4 heures
1h 24 min 54s = 1 + 0,4 + 0,015 = 1,415 h
306,660 km en 1,415 h
Vitesse : 306,660 / 1,415 = 216,7 km/h

2.
217,812 km en 1 h
306,660 km en 306,660/217,812 = 1,408 h
1h
0,408 x 60 = 24,48 minutes
0,48 x 60 = 28,8 secondes
1h 24 minutes 28 secondes

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