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23 November, 19:57

A truck with a heavy load drove from Boston to New York at 40 mph. After unloading, it returned from New York to Boston at a speed of 60 mph. What was its average speed for the whole trip?

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  1. 23 November, 21:38
    0
    48 mph

    Step-by-step explanation:

    Let one way distance be D

    40 = D/T1

    T1 = D/40

    60 = D/T2

    T2 = D/60

    Total distance: 2D

    Total time: D/60 + D/40

    (2D + 3D) / 120 = 5D/120 = D/24

    Average speed:

    2D : D/24

    2D * 24/D

    48
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