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Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

Terri makes a quilt using three sizes of fabric squares the side lenght of each fabric square is the square root of the area

It takes jonas 7 1/4 minutes to run the mile. it takes mario 8 5/12 to run the mile. how much faster is jonas than mario? 5/6 minute 1 1/3 minutes 1 1/6 minutes 1 1/2 minutesi will give points and brainlest