book Maths Puzzle Numerical Ability

I have one more (18x^5y^2/6x^2y^-4)^-1. I am hoping with the explantion I will be able to understand more. Thank you for your help..

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book Other Question

A car starts at 7 AM and travels at 80 kph. Another car starts at 10 AM from the same place and goes in the same direction. How fast will it have to go to catch up with the first one by 4 PM of the same day? Is there any specific formula other than strategies such as guess-and-check to solve equations like this -- 3(4y-1)-(y+2)=7.35?