Write a positive or negative integer for an increase of $15

Look at attachment. has all info needed. need

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?

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?