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anonymous

  • 5 years ago

It takes eight hours for a 600 km journey, if 120 km is done by train and the rest by car. It takes 20 minutes more, if 200 km is done by train and the rest by car. The ratio of the speed of the train to that of the cars is:

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  1. anonymous
    • 5 years ago
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    the question is worded very badly

  2. anonymous
    • 5 years ago
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    so distance = speed x time

  3. anonymous
    • 5 years ago
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    time = distance / speed

  4. anonymous
    • 5 years ago
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    let the train speed be x, and the car speed be y

  5. anonymous
    • 5 years ago
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    The first sentence tells us that (120/x) +(480/y) = 8 { note: all values are in km and hours , therefore when we solve the equations the units of x and y will be km /hr ( not that it matters because they want the ratio

  6. anonymous
    • 5 years ago
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    the second sentence tells us that (200 / x ) + 400/ y = 8 1/3 ( note 1/3rd of an hour = 20mintues

  7. anonymous
    • 5 years ago
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    then solve them

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