exam Maths Puzzle Numerical Ability

(x^2-25)/(x^3-4x^2-5x)*(x^2+x)/(1-x^2)

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exam Other Question

Two cars take off from a starting line heading in the same direction. One car is traveling at 40 mph and the other at 55 mph. How much time must pass before the cars are 5 miles apart. Hello! I am having problems with with the problem and need some help.

solve: Square root x-1 =x-3

Thank you for the help