Question 812711
Make a data table:   speed, time, distance.
Since the variables as unknown seem to be time, look carefully about time to assign variables and expression, and build from there.


Slow car begins first and goes for time x+2 hours.
Fast car begins later than the first, and goes for x hours.


Now put what we have into the data table and analyze.


WHICH_________________speed___________time_____________distance
SLOW__________________45______________x+2______________d
FAST__________________60______________x________________d


Remember, Rate*Time=Distance, and you want to know for what x value will the distance traveled for SLOW and FAST car to be the same.