document.write( "Question 715159: Two trains leave the station at the same time, one heading west and the other east. The westbound train travels at 90 miles per hour. The eastbound train travels at 80 miles per hour. How long will it take for the two trains to be 442 miles apart? \n" ); document.write( "

Algebra.Com's Answer #439341 by josmiceli(19441) $\"\"$ $\"About$

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Since they are heading directly opposite
\n" ); document.write( "eachother, you can think of 1 train as
\n" ); document.write( "standing still and the other train as
\n" ); document.write( "moving at the sum of their speeds
\n" ); document.write( "------------------
\n" ); document.write( "Let $\"+t+\"$ = time in hrs
\n" ); document.write( " $\"+442+=+%28+90+%2B+80+%29%2At+\"$
\n" ); document.write( " $\"+t+=+442+%2F+170+\"$
\n" ); document.write( " $\"+t+=+2.6+\"$
\n" ); document.write( " $\"+.6%2A60+=+36+\"$
\n" ); document.write( "In 2 hrs and 36 min, they will be 442 mi apart
\n" ); document.write( " \n" ); document.write( "

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