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(g + 4) / (g - 2)  = ( g - 5) (g- 8)

Cross-multiply

(g + 4) (g - 8)  = (g - 2) (g - 5)

g^2 - 4g - 32  =  g^2 - 7g + 10     subtract g^2 from both sides

-4g  - 32  = -7g + 10    add 32 , 7g to both sides

3g  = 42     divide both sides by 3

 g = 14

11. Distance / Rate  = Time

Equating times, we have

  6                      4

____    =       ______     cross-multiply

R + 3                 R

6R  =  4(R + 3)

6R   = 4R + 12

2R  = 12

R  =  6 mi/h   =   upstream rate    

R + 3  =   6 + 3  =  9 mi / h  =  downstream rate