SOLUTION: My question is how to solve this problem. Jeff starts driving at 65mph from the same point that Lauren starts driving at 40mph. They drive in opposite directions , and Lauren ha

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Question 178270: My question is how to solve this problem.
Jeff starts driving at 65mph from the same point that Lauren starts driving at 40mph. They drive in opposite directions , and Lauren has a half-hour head start. How long will they be able to talk on their cell phones that have a 480-mile range?
I tried to work it using the D=R*T
65x+40(x+1)=480
65x+40x+40=480
105x+40=480
-40 -40
105x=440
and the answer I got was 4 4/21 but that is not one of the options.
The options are: 4 8/21
4 17/30
4 16/21
4 4/7
Thank You for your help!
Answer by EMStelley(187) About Me  (Show Source):
You can put this solution on YOUR website!
I think your problem is that you set up the problem assuming Lauren has an hour head start, when in fact, the problem states that she only had a half hour head start.