document.write( "Question 192057: It takes John 4 1/2 hours to complete a job alone, and it takes 2 hours for Laura to do the same job alone. How long would it take for them to complete the job working together? \n" ); document.write( "

Algebra.Com's Answer #144128 by Mathtut(3670) $\"\"$ $\"About$

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john can do 2/9 of the job per hour
\n" ); document.write( "Laura can do 1/2 of the job per hour
\n" ); document.write( ":
\n" ); document.write( "together:
\n" ); document.write( ":
\n" ); document.write( " $\"%281%2F2%2B2%2F9%29t=1\"$
\n" ); document.write( ":
\n" ); document.write( " $\"%289%2F18%2B4%2F18%29t=1\"$
\n" ); document.write( ":
\n" ); document.write( " $\"%2813%2F18%29t=1\"$
\n" ); document.write( ":
\n" ); document.write( "t=18/13 of an hour \n" ); document.write( "

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