Hi

Let x and (x+20mph)represent their respective speeds.  t = D/r

Question states***

  330/x + 330/(x+20) = 3hr

Solving for x

 330(x+20) + 330x = 3x(x+20)

  660x + 6600 = 3x^2 + 60x

   3x^2 -600x - 6600 = 0

  3(x^2 - 200x - 2200) = 0



  x = 210.4536   |negative solution tossed out for speed

CHECKING our Answer***

  330/210 + 330/230 = 3hr  |to the nearest whole number 

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