document.write( "Question 258005: Running at an average rate of 6 meters per second, a sprinter ran to the end of the track. The sprinter then jogged back to the starting point at an average rate of 3 meters per second. The total time for the sprint and the jog back was 2 minutes and 40 seconds. Find the length of the track. \n" ); document.write( "
Algebra.Com's Answer #189857 by richwmiller(17219)\"\" \"About 
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2 minutes 40 seconds=160 seconds\r
\n" ); document.write( "\n" ); document.write( "6x=3(160-x)\r
\n" ); document.write( "\n" ); document.write( "x=160/3
\n" ); document.write( "6*160/3=2*160=320 meters long
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\n" ); document.write( "6*160/3+3*(160-160/3)=640\r
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