2013


Problem - 1838
Joy is riding her bicycle up a hill. After traveling 3 km, Joy passes Greg, who is walking down the hill at a rate of 1 m/s. Joy continues up the hill for another 7 km before riding down at double the average speed she rode up. Joy and Greg arrive at Joy\u2019s starting point at the same moment. In meters per second, what was Joy's average speed going down the hill?

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