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    Riding a mountain bike up and down a mountain | 
  2015-12-02 | 
   
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  From sam: 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? Answered by Penny Nom. | 
   
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