SOLUTION: Jeff starts driving at 55mph from the same point lauren starts driving at 70mph. They drive in the opposite directions and Lauren has a half hour head start. How long will they be

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Question 636806: Jeff starts driving at 55mph from the same point lauren starts driving at 70mph. They drive in the opposite directions and Lauren has a half hour head start. How long will they be able to talk on their cellphones that have a 280 mile range?
The answers we have to chose from are in form of a fraction with a whole number.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
Jeff starts driving at 55mph from the same point Lauren starts driving at 70mph.
They drive in the opposite directions and Lauren has a half hour head start.
How long will they be able to talk on their cellphones that have a 280 mile range?
:
t = talking time as they travel in opposite direction
:
Write a distance equation; dist = speed * time
:
55t + 70(t+.5) = 280
55t + 70t + 35 = 280
125t = 280 - 35
125t = 245
t = 245/125 = 49/25
t = 124%2F25 hrs they can talk on the cell phone