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Camille can swim against the current at 1.5 m/s and with the current at 3.5m/s. Write an equation that expresses each fact. How fast can she swim in still water?

  • algebra -

    the upstream and downstream speeds differ by twice the current speed, or 2 m/s.

    so, still-water speed is 2.5 m/s

    up = s+r
    down = s-r

    s = (up+down)/2 = (1.5+3.5)/2 = 2.5

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