document.write( "Question 72718This question is from textbook Algebra:Structure and Method
\n" ); document.write( ": One computer can process a payroll in 60 minutes. A newer computer can process a payroll in 40 minutes. How long would it take to process the payroll if both computers worked together? \n" ); document.write( "
Algebra.Com's Answer #51989 by ankor@dixie-net.com(22740)\"\" \"About 
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One computer can process a payroll in 60 minutes. A newer computer can process a payroll in 40 minutes. How long would it take to process the payroll if both computers worked together?
\n" ); document.write( ":
\n" ); document.write( "Let x = time required when computers work together:
\n" ); document.write( "Let the completed job = 1
\n" ); document.write( ":
\n" ); document.write( "\"x%2F60+%2B+x%2F40\" = 1
\n" ); document.write( ":
\n" ); document.write( "multiply equation by 120 to get rid of the denominators:
\n" ); document.write( "2x + 3x = 120
\n" ); document.write( ":
\n" ); document.write( "5x = 120
\n" ); document.write( "x = 120/5
\n" ); document.write( "x = 24 minutes working together
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\n" ); document.write( "Check:
\n" ); document.write( "24/60 + 24/40 =
\n" ); document.write( "2/5 + 3/5 = 1
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