Hi,

What is Al's rowing rate in still water?

t = D/r

*** |Multiplying thru by (x+40(x-4) so as all denominators = 1

  5(x-4) + 5(x+4) = 3(x+4)(x-4)

      10x = 3x^2 - 48

     3x^2 - 10x - 48 = 0







   x = 6,   (tossing out negative solution for unit measure)

  6kph is Al's rowing rate in still water

CHECKING our answer***

 5/10 + 5/2  = 5/10 + 25/10 = 30/10 = 3hr

Wish You the Best in your Studies.

 

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