document.write( "Question 1171222: one machine can complease a job in 10 minutes if the same job is done by this machine and an older machine working together the two job can be completed in 6 minutes. how long
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Algebra.Com's Answer #796149 by MathLover1(20850)\"\" \"About 
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\n" ); document.write( "\n" ); document.write( "Machine \"A\":\"+10\" minutes
\n" ); document.write( "rate \"1%2F10\" of job in \"1\" minute\r
\n" ); document.write( "\n" ); document.write( "Machine \"B+%2B++A+=+6+\"minutes
\n" ); document.write( "they do \"1%2F6\" of the job in \"1\" minute\r
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\n" ); document.write( "\n" ); document.write( "Job done by \"B\" in \"1\" minute =
\n" ); document.write( "\"1%2F6+-1%2F10\"
\n" ); document.write( "=\"%2810-6%29%2F60\"
\n" ); document.write( "=\"4%2F60\"
\n" ); document.write( "=\"1%2F15\"\r
\n" ); document.write( "\n" ); document.write( "so machine \"B+\"will take \"15\" minutes to do the same job\r
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