Hi,

Going north with jet stream, a plane makes a 1200 mile trip in 3 hours. 

Going south against the jet stream, the plane makes the trip in 4 hours.

 D = rt   or D/t = r

 1200/3  = r + s

 1200/4  = r - s 

  400 = r + s

  300 = r - s

   700 = 2r

 r = 350mph, speed of plane and speed of jet stream is 50mph  (350+s = 400) 

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