book Maths Puzzle Numerical Ability

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?

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book Other Question
I need to Factor polynomial, if possbile

xy - ty + xs - ts


Any help would be great:) 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..