Hi,

Let x represent the speed of the canoe in still water

  |Multiplying thru by (x+3mph)(x-mph3) so as all denominators = 1

    36x = 8x^2 - 72

  8x^2 -36x - 72 = 0

  2x^2 -9x - 18 = 0

 

 

    (Tossing out the negative solution for unit measure)

  x = 6mph is the speed of the canoe in still water

CHECKING our answer***

 = 8hr

Wish You the Best in your Studies.

 

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