document.write( "Question 1037888: it takes a computer 30 mins to process and print payroll checks, when a second computer is used and the two computers work together the checks can be processed and printed in 21 minutes. how long would it take the second computer by itself to process and print the payroll checks? \n" ); document.write( "

Algebra.Com's Answer #652541 by Boreal(15235) $\"\"$ $\"About$

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in one minute computer A does 1/30 the work.
\n" ); document.write( "in one minute computer B does 1/x the work
\n" ); document.write( "(1/30)+(1/x)=1/21 Both together do 1/21 in one minute
\n" ); document.write( "multiply everything by 630x
\n" ); document.write( "21x+630=30x
\n" ); document.write( "9x=630
\n" ); document.write( "x=70 minutes \n" ); document.write( "

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