Best Answer

54 miles per hour



1 hr and 20 minutes = 1 and 20/60 hours = 1 1/3 hours = 4/3 hours

72 miles travelled in 4/3 hours

therefore divide 72 by 4/3 to see how far travelled in 1 hour

72 / (4/3) = 72 * (3/4) = 54 miles in 1 hour

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Q: What is the average velocity of the car in miles per hour over the whole distance if it traveled 72 miles in 1 hour and 20 minutes?
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