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On a cross-country trip, a couple drives 500 mi (miles) in 10h on the first day, and 400 mi in 8h on a second day. the average speed for the whole trip is:
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On a cross-country trip, a couple drives 500 mi (miles) in 10h on the first day, and 400 mi in 8h on a second day. the average speed for the whole trip is:

User Rhys Stephens
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The average speed = total distance ÷ total time traveled

The average speed = [500+400] ÷ [10+8]
The average speed = 900 ÷ 18 = 50 miles/hour
User Tiep Vu Van
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