exam Maths Puzzle Numerical Ability

HOW DO I EXPRESS EACH RATIO AS A UNIT RATE ROUNDING TO NEAREST TENTH OR CENT? EXAMPLE: 145 MILES IN 3 HRS

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exam Other Question
In a car race, Car A starts 1 mile behind Car B. Car A is traveling 65 miles per hour, while Car B is traveling at 55 miles per hour. How long will it take for Car A to overtake Car B. Could someone be so kind in helping me with this problem?

I need to solve the following systems by substitution:

4x - 12y = 5
-x + 3y = -1

Thanks so much,
Ashley