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JJ's boat will go 15 mph in still water. If he can go 12 mph downstream in the same amount of time it takes to go 9 mph upstream, what is the speed of the current?

  • Math -

    Vb + Vc = 12.
    Vb - Vc = 9.
    Add the Eqs:
    2Vb = 21.
    Vb = 10.5 MPH.
    Vc = 1.5 mph.

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