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/ Vitesse moyenne :
Vitesse moyenne :
February 22, 2026
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\text{Temps}_2 = \frac{150}{90} = \frac{5}{3} \text{ heures} \approx 1.67 \text{ heures}
Temps total pour le trajet :
\text{Temps total} = 2.5 + \frac{5}{3} = \frac{7.5}{3} + \frac{5}{3} = \frac{12.5}{3} \approx 4.17 \text{ heures}
\text{Vitesse moyenne} = \frac{\text{Distance totale}}{\text{Temps total}} = \frac{300}{\frac{12.5}{3}} = \frac{300 \times 3}{12.5} = \frac{900}{12.5} = 72 \text{ mph}
#### 72 mph
Question 3
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