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7 January, 15:01

It took Ellen 4.5 hours to drive to her mother's house on Wednesday morning. On her return trip on Thursday night, traffic was heavier, so the trip took her 5 hours. Her average speed on Thursday was 4 mph slower than on Wednesday. What was her average speed on Thursday ?

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  1. 7 January, 15:27
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    36 mph was her average speed on Thursday

    Step-by-step explanation:

    dа ta:

    Wednesday

    time = 4.5 hours

    rate = x

    Thursday

    time = 5 hours

    rate = 4 mph slower than on Wednesday = x-4

    Solution

    We know that distance = (rate) (time)

    So the distante on Monday is 4.5x and the distance on

    Wednesday is 5 (x-4)

    As we know she drove the same distance so we have that

    4.5x=5 (x-4)

    4.5x=5x-20

    4.5x-5x=-20

    -.05x=-20

    x=40

    Hence 40-4=36 mph
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