book Maths Puzzle Numerical Ability

Car A leaves point A traveling at 60 mph. Car B leaves point B traveling at 30 mph. They meet 10 minutes later. How far apart were they when they started?

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book Other Question

m^2-16 over m^2-6m+9 divide by 8-2m over m-4m-12

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When solving a rational equation, why is it OK to remove the denominator by multiplying both sides by the LCD and why can you not do the same operation when simplifying a rational