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well 40 miles per hour means that a car goes 40 miles in one hour... so if a car is going 80 miles in one hour and you divide the 80 and one hour by 2.. then you get 40 miles in 30 minures.. and the car is going 80 miles per hour.

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Q: How many miles per hour does a car travel if it makes a 40-mile trip in 30 minutes?
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