Niki is a competitor in the Rocky Mountain Bike Tour. She rides 6 miles uphill at an average speed of 3 mph and 6 miles downhill at an average speed of 12 mph. How many hours does it take her to complete the trip? Express your answer as a mixed numeral.
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A bicyclist travels uphill from town A to town B for 2 hours at an average speed of 4 miles per hour and returns along the same road at an average speed of 6 miles per hour. What is the bicyclist's average speed for the round trip, in miles per hour?
1) 4 4/5
2)5
3)5 1/5
4)5 2/5
5) 5/35
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