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Can you please answer this question and show all of the steps and say the correct letter

Suppose you drive for 60 miles at 60 miles per hour, then for 60 miles at 30miles per hour. In miles per hour, what is your average
velocity?
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Suppose you drive for 60 miles at 60 miles per hour, then for 60 miles at 30miles per hour. In miles per hour, what is your average velocity?

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