Question 448583
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Hi,
Let x be the maximum speed of the plane and y be the speed of the wind
Question states*** Note: D = r*t  or r = D/t
x +y = 525mph   |2100mi/4hr = 525mph
x -y = 350mph   |2100mi/6hr = 350mph
  2x = 875
   x = 437.5mph, speed of plane.  Wind speed is 87.5