Distance totale pour le trajet aller-retour = \( 2d \) miles.
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- Soit la distance entre la ville A et la ville B \( d \) miles.
- Temps pris de la ville A à la ville B : \( \frac{d}{60} \) heures.
- Temps pris de la ville B à la ville A : \( \frac{d}{40} \) heures.
- Temps total pour le trajet aller-retour = \( \frac{d}{60} + \frac{d}{40} \).
- Pour additionner les fractions, trouvez un dénominateur commun :
- \frac{d}{60} + \frac{d}{40} = \frac{2d}{120} + \frac{3d}{120} = \frac{5d}{120} = \frac{d}{24} \text{ heures}
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