exam Maths Puzzle Numerical Ability

For all r not equal to + or - 2, r^2-5r+6/r^2-4

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I am not sure how to answer this homework problem. It is an online math class, I am not sure of its origins.
-2x+4>12 A six-passanger plane cruises at 180 mph in calm air. If the plane flies 7 miles with the wind in the same amount of time as it files 5 miles against wind, then what is the wind sp