document.write( "Question 665488: A train leaves Washington and travels north at 85 miles per hour. Another train leaves at the same time and travels south at 60 miles per hour. How long before they are 580 miles apart \n" ); document.write( "

Algebra.Com's Answer #413889 by josmiceli(19441) $\"\"$ $\"About$

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You can think of one train as standing still and
\n" ); document.write( "the other moving away at the sum of their speeds
\n" ); document.write( " $\"+580+=+%28+85+%2B+60+%29%2At+\"$
\n" ); document.write( " $\"+145t+=+580+\"$
\n" ); document.write( " $\"+t+=+4+\"$
\n" ); document.write( "They will be 580 mi apart in 4 hrs
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