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Today, 03:30

James can jog twice as fast as he can walk. He was able to jog the first 9 miles to his grandmother's house, but then he tired and walked the remaining 1.5 miles. If the total trip took 2 hours, then what was his average jogging speed?

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  1. Today, 06:21
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    6 mile/hour

    Explanation:

    Let the speed of walking of James = x mile/hour

    speed of jogging = 2x mile/hour

    9/2x + 1.5/x = 2

    = > (9 + 3) / 2x = 2

    = > 12 = 4x

    = > x = 3

    Average speed of walking = 3 mile/hour

    Average speed of jogging = 2 * 3 = 6 mile/hour
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