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29 May, 15:01

Harry drove for 4 hours on the freeway, then decreased his speed by 20 miles per hour and drove for 5 more hours on a country road. if his total trip was 368 miles, then what was his speed on the freeway

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  1. 29 May, 15:15
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    4f+5c=485 miles

    f=c+20

    Substitute

    4 (c+20) + 5=485

    4c+80+5c=485

    9c+80=485

    9c=405

    c=45 mph

    f=45+20

    f=65 mph.
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