exam Maths Puzzle Numerical Ability

Ben and Jerry start from the same point and ride their bicycles in opposite directions. If Ben rides twice as fast as Jerry and they are 90 miles apart after four hours, then what

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Please simplify this:

1/a-b + 4/b-a - 8/a+b - 11a-5b/b^2-a^2

I have no idea where to begin. Please help--Thanks. a=8, b= 6, d=3, and y=5

The quotient of the difference of the cube of b and the cube of d and the difference of b and d cubed.