document.write( "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? \n" ); document.write( "
Algebra.Com's Answer #484976 by Alan3354(69443)\"\" \"About 
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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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\n" ); document.write( "It depends on the directions.
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