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March 27, 2017

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a train leaves a station and travels north at 85 km/hr. Four hours later, a second train leaves on a parrallel track and travels north at 125km/hr. How far from the station will they meet?

  • Algembra - ,

    Train #1 = t hrs.
    Train #2 = (t-4)hrs.

    When train #2 catches up, they would have traveled the same distance:

    d1 = d2.
    85t = 125(t-4),
    85t = 125t - 500,
    125t - 85t = 500,
    40t = 500,
    t = 12.5 hrs.

    d = Vt = 85 * 12.5 = 1062.5km.

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