Can i get on this question to explain to me why the answer is a or b or c

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. what distance from city a is the point where the truck and the car will meet?

Plz hurry evaluate the expression a+b where a=8 and b=19

Astudent showed the steps below while solving the inequality |x-4|< 1 by graphing.