Question 53489
Well, if the two cars have one hour before they meet, you need to ask yourself..."How far will each car travel in one hour at their present speed?"

The L. A. car is traveling at 80 mph so it will go 80 miles in one hour.
The Palm Springs car is traveling at 60 mph so it will go 60 miles in one hour.

Add the two distances together...80 miles + 60 miles = 140 miles.

So the two cars will be 140 miles apart 1 hour before they meet.

Does this make sense?