book Maths Puzzle Numerical Ability

This is my promblem. Please help!

Due to road construction delays the Swansons averaged only 36 mph on their trip to their vacation home last summer. This summer they averaged

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book Other Question
How do you factor 4x-8+6y. The answer turns out to be 3, but dont know how you get that? how do I determine the x and y intercepts of the graph of x=3y^2-9 ??

Thanks