document.write( "Question 229673: Two trains leave Chicago, one traveling east @ 30 mph and one traveling west @ 40 mph. When will the trains be 210 miles apart? Answer 3 hrs., but how do you set up the problem? \n" ); document.write( "
Algebra.Com's Answer #170215 by rfer(16322)\"\" \"About 
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moving away from each other at 70 mph
\n" ); document.write( "210/70=3 hrs
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