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6 July, 04:51

Two cars are 400 miles apart when they start moving towards each other. The speed of the first car is 30 mph. The the second car moves 20 mph faster than the first car. After how many hours will the cars meet?

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  1. 6 July, 07:55
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    Answer

    t = 5 hrs

    Step-by-step explanation:

    let

    speed of the first car = 30 mph

    speed of the second car = 20 mph + 30 mph = 50 mph

    When the cars meet we know both cars will have traveled a total distance of 400 miles.

    Therefore,

    let's make a distance equation

    speed = distance/time

    distance = speed * time

    first car + second car = 400 miles

    30t + 50t = 400

    80t = 400

    divide both sides b 80

    t = 400/80

    t = 5 hrs
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