SOLUTION: Jeff starts driving at 55 miles per hour from the same point that lauren starts driving at 60 miles per hour. They drive in opposite directions, and Lauren has a half-hour head sta

Question 362914: Jeff starts driving at 55 miles per hour from the same point that lauren starts driving at 60 miles per hour. 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 280-mile range?
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
Jeff speed = 55mph
lauren speed =60 mph
...
they are moving away from each other
so effective speed = 60+55 = 115 mph
range of mobile = 280 miles
...
t= distance/speed
t=280/115
t = 2.4 hours they can be in contact on their cell
...
m.ananth@hotmail.ca
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