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a train left podunk and traveled north at 75 km/h. two hours later, another train left podunk and traveled in the same direction at 100 km/h. how many hours had the first train traveled when they were 1420 km apart?

  • math -

    When they are 1420 km apart let the time taken by the first train be t hrs,
    then the time taken by the second train be t-2 hrs

    distance traveled by 1st train = 75t
    distance traveled by 2nd train = 100(t-2)

    what do you know about the two distances?

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