document.write( "Question 719867: 2 cars travel in opposite directions with one going 15mph faster after 3 hours they are 405 miles apart. What's the speed of each car? \n" ); document.write( "

Algebra.Com's Answer #441568 by josmiceli(19441) $\"\"$ $\"About$

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Think of this as 1 car standing still and
\n" ); document.write( "the other car traveling at the sum of their speeds
\n" ); document.write( "Let $\"+s+\"$ = the speed of the slower car
\n" ); document.write( " $\"+s+%2B+15+\"$ = the speed of the faster car
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\n" ); document.write( " $\"+405+=+%28+s+%2B+s+%2B+15+%29%2A3+\"$
\n" ); document.write( " $\"+405+=+6s+%2B+45+\"$
\n" ); document.write( " $\"+6s+=+360+\"$
\n" ); document.write( " $\"+s+=+60+\"$
\n" ); document.write( " $\"+s+%2B+15+=+75+\"$
\n" ); document.write( "The speeds of the cars are 60 mi/hr and 75 mi/hr\r
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