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C leaves home going 40 km/h. when c is 9 km from home, d starts after c from the same place, going 58 km/h. how long does it take d to catch up to c?

  • algebra -

    time c goes alone = 9/40
    time d goes = (t -9/40)
    distances are the same so
    40 t = 58 (t - 9/40)

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