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You and your family take a trip to see your aunt who lives 100 miles away along a straight highway. the first 60 miles of the trip are driven at 55 mi/h but then you get stuck in a standstill traffic jam for 20 minutes. in order to make up time, you then proceed at 75 mi/h for the rest of the trip. what is the magnitude of your average velocity for the whole trip?
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