book Maths Puzzle Numerical Ability

two cares leave st.louis. one travels north and one travles south. the care traveling north is moving 10mph faster than the care traveling south. after three hours the cars are 354

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4-Y=13

9y=36 I think this is the right category to put this in

Evaluate the factorial expression.

(n+5)!/n+5

I got n+5! as my answer. is that right?