book Maths Puzzle Numerical Ability

Hi I need a little help with this problem. The directions are to find the LCD and do not combine fractions.
13/x^2-16, 7/x-4
If you could show how you did the problem it would be a big help.. Thank you.

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book Other Question
Mrs N and Mrs B drove a total of 140 miles in 3.4 hours. Mrs N drove first at 35 mph, Mrs B drove the remainder of the trip at 45 mph. For what length of time did Mrs B drive? what if it is to the zero power what do you do?