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Problem of the Week
Problem C
Uphill and Downhill

Rory biked \(36\) km up a trail from his campsite to a lookout point. On the way up, his average speed was \(9\) km/hr. On the way back down, he biked faster, with an average speed of \(12\) km/hr. What was his average speed, in km/hr, for the entire trip?

Theme: Number Sense