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a train left podunk and traveled west 70 km/h. two hours later, another train left podunk and traveled east at 90km/h. how many hours had the first train traveled when they were 1420 km apart?

  • math -

    After t hours since the second train left the station,
    the first train went 70t + 140
    the second train 90t

    so solve 70t + 140 + 90t = 1420

    (I got t=8, confirm this please)

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