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

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Question 629328: 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?

Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

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?

Note: D = rt and time is the same for both

  70t + 65t = 270mi     || Solve for t