Algebra

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Briana can row 4 miles per hour is still water. It takes as long to row 8 miles upstream as 24 miles downstream. How fast is the current?

  • Algebra -

    speed of current = u
    speed upstream = (u-4)
    speed downstream = (u+4)

    8 = (u-4) T so T = 8/(u-4)
    24 = (u+4) T so T = 24/(u+4)

    8/(u-4) = 24/(u+4)

    24(u-4) = 8 (u+4)

    24 u - 96 = 8 u + 32

    16 u = 128

    u = 8

  • Algebra -

    How did you do 8/(u-4) which turned in to 8(u-4)

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