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Un article trouvé pour ce sujet.
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Riding a mountain bike up and down a mountain |
2015-12-02 |
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sam pose la question :
Michael, can climb a mountain at 2.5km/hr on his mountain bike. he descends the mountain at 5.5km/hr. he completes the whole circuit in 7 hours. how long is the trail to the top of the mountain?
Penny Nom lui répond. |
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