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11 November, 15:54

Jason drives uphill from home to school, averaging 20 miles per hour. On the way back, he drives back downhill from school to home at 60 miles an hour. What was the average speed in miles per hour for his round trip?

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  1. 11 November, 16:58
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    Average velocity = 30 miles per hour

    Explanation:

    Given that

    Velocity for uphill = 20 miles per hour

    Velocity for downhill = 60 miles per hour

    We know that

    Distance = Velocity x time

    Total distance = Average velocity x total time

    Lets take distance from home to school is s

    Time taken from home to school = s/20 hr

    Time taken from school to home = s/60 hr

    Total time = s/20+s/60

    Total distance = Average velocity x total time

    s + s = Average velocity x (s/20+s/60)

    So average velocity = 30 miles per hour
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