book Maths Puzzle Numerical Ability

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?

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Jane brough 15 tickets at the carnival. Short rides cost 2 tickets, medium rides cose 3 tickets and long rides cost 4 tickets. She used up all her tickets to go on 6 rides. What ar 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.