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Two trains leave a train station at the same time. One travels east at 10 miles per hour. The other train travels west at 9 miles per hour. In how many hours will the two trains be 85.5 miles apart

  • math -

    let the time be t hours
    so 10t + 9t = 85.5

    I will let you finish it.

  • math -

    4.5 hours

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