exam Maths Puzzle Numerical Ability

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x^2-x-6/x^2-2x-8 . x^2+7x+12/x^2-9

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exam Other Question

5. Mandy begins bicycling west at 20mph. Liz leaves from the same point 1 hour later bicycling west at 30mph. When will she catch up with Mandy?

a. Define the variables.
b. M Factor: 2ax^2 + bx^2 - 4ay - 2 by