book Maths Puzzle Numerical Ability

(-P->-L) & (-L->L) |- P

I have no clue what I am doing....i know i have to provisionally assume something but i have no clue where to get started. I understand what i'm doing i

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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 miles apart. how fast is each car traveling? I would like to know how to figure these two problems out step by step using equations that contain like terms. Here are the questions:
1. Peter used a $5.00 gift certificate to h