document.write( "Question 835077: two cars leave from the same point at the same time, traveling in opposite directions. one travels 15 mph slower than the other. after 6 hours, they are 639 miles apart. Find the rate of each car. \n" ); document.write( "
Algebra.Com's Answer #503348 by josgarithmetic(39617)\"\" \"About 
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_____________speed____________time_____distance_______
\n" ); document.write( "Faster_______r_________________6_______r*6____________
\n" ); document.write( "Slower______r-15_______________6_______(r-15)*6_______
\n" ); document.write( "Total__________________________________639\r
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\n" ); document.write( "\n" ); document.write( "Last part of the description and the distance column give the equation,
\n" ); document.write( "\"highlight%28r%2A6%2B%28r-15%29%2A6=639%29\"
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\n" ); document.write( "\"6r%2B6r-90=639\"
\n" ); document.write( "\"12r=639%2B90\"
\n" ); document.write( "\"12r=729\"
\n" ); document.write( "\"highlight%28r=61%29\" mph\r
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\n" ); document.write( "\n" ); document.write( "(Actual computation to r=60.75)
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