Question 1048256
Determine the average velocity and total time for a car that travels 54 miles per hour for 90 miles and hurries home the same distance at 67.5 miles per hour
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Avg speed of a round trip = 2*r1*r2/(r1+r2)
= 2*54*67.5/(54 + 67.5)
= 60 mi/hr
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Notice that the distance is not relevant.