SOLUTION: A train leaves Philadelphia traveling at 70 mph. One hour later a second train leaves traveling at 80 mph. How long will it take for the trains to be 520 miles apart?

Question 804847: A train leaves Philadelphia traveling at 70 mph. One hour later a second train leaves traveling at 80 mph. How long will it take for the trains to be 520 miles apart?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
A train leaves Philadelphia traveling at 70 mph. One hour later a second train leaves traveling at 80 mph. How long will it take for the trains to be 520 miles apart?
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It depends on the directions.
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