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A car travels a distance D1 = 90 miles with an average speed of 45 miles per hou {mph} Then travels a second distance D2

A car travels a distance D1 = 90 miles with an average speed of 45 miles per hou {mph} Then travels a second distance D2 = 72 miles with an average speed of 2' .nph. What is the average velocity of the whole trip in mph

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