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March 26, 2017

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Two trains heading toward each other are 400 miles apart. One train travels 15 miles per hour faster than the other train. If they arrive at the same station in 5 hours, how fast is each train traveling?

  • math - ,

    time = distance over speed
    since the time is the same for both trains, and their combined distance is 400,

    d/s = (400-d)/(s+15) = 5
    d = 5s, so

    (400-5s)/(s+15) = 5
    s = 32.5
    d = 162.5

    check: 162.5/32.5 = 5
    237.5/47.5 = 5

  • math - ,

    100

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