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27 March, 00:25

Two cars start from two towns 400 miles apart and travel towards each other. They pass each other after 4 hours. find the speed of each car if the difference between their speeds is 20 miles per hour.

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  1. 27 March, 00:41
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    use an expression

    s = speed of the slower car

    then

    (s+20) = speed of the faster car

    When they meet is after 400 miles

    Write distance equation

    slow car d + fast car d = 400 mi

    4s + 4 (s+20) = 400

    8s + 80 = 400

    8s = 400 - 80

    8s = 320

    s = 40 m/H
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