document.write( "Question 548824: Two cars leave a city at the same time, one trabels north and the other south. The car that is trabeling south averaged 12 miles/hr faster than the car traveling north. After 3 hours they are 396 miles apart. How fast is each car traveling? \n" ); document.write( "

Algebra.Com's Answer #357238 by josmiceli(19441) $\"\"$ $\"About$

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Let the speed of the slower car = $\"+s+\"$
\n" ); document.write( "the speed of the faster car is $\"+s+%2B+12+\"$
\n" ); document.write( "They are moving apart at the sum of their speeds
\n" ); document.write( "given:
\n" ); document.write( " $\"+396+=+%28+s+%2B+s+%2B+12+%29%2A3+\"$
\n" ); document.write( " $\"+3%2A%28+2s+%2B+12+%29+=+396+\"$
\n" ); document.write( " $\"+6s+%2B+36+=+396+\"$
\n" ); document.write( " $\"+6s+=+360+\"$
\n" ); document.write( " $\"+s+=+60+\"$
\n" ); document.write( " $\"+s+%2B+12+=+72+\"$
\n" ); document.write( "The car going south has speed of 72 mi/hr
\n" ); document.write( "The car going north has speed of 60 mi/hr \n" ); document.write( "

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