exam Maths Puzzle Numerical Ability

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I have no idea how to type in math problems - (i.e., Squared, etc.)
My problem is finding the LCD and steps to solve reational expressions.
7x + 1 divided by x squared minus 9 (minus) 5 divided by x minus 3
Thank you!
the fast freight train made the trip in 6 hours. The next day the slow freight train made the same trip in 8 hours. What was the speed of the slow freight train if the fast freight train traveled 20 mph faster than the slow freight train?