SOLUTION: Two cars leave Memphis from exactly the same spot at exactly the same time, one traveling north at an average speed of 70 mph and the other traveling south at an average speed of 6

Algebra ->  Customizable Word Problem Solvers  -> Travel -> SOLUTION: Two cars leave Memphis from exactly the same spot at exactly the same time, one traveling north at an average speed of 70 mph and the other traveling south at an average speed of 6      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 629332: Two cars leave Memphis from exactly the same spot at exactly the same time, one traveling north at an average speed of 70 mph and the other traveling south at an average speed of 65 mph. Approximately how long does it take before the cars are 270 miles apart?



1 hour 18 minutes


1 hour 28 minutes


1 hour 38 minutes


1 hour 48 minutes


2 hours


Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Two cars leave Memphis from exactly the same spot at exactly the same time, one traveling north at an average speed of 70 mph and the other traveling south at an average speed of 65 mph. Approximately how long does it take before the cars are 270 miles apart?
---------------
The speeds are added when going in opposite directions.
-----
d = r*t
t = d/r