document.write( "Question 343335: It takes a girl 36 minutes to deliver the newspapers on her route; however, if her brother helps, it takes them only 20 minutes. How long would it take her brother to deliver the newspapers by himself? \n" ); document.write( "
Algebra.Com's Answer #245680 by mananth(16946)\"\" \"About 
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girl takes 36 minutes
\n" ); document.write( "1/36 of the job she does in 1 minute
\n" ); document.write( "..
\n" ); document.write( "together they do do in 20 minutes
\n" ); document.write( "1/20 of the job they do in 1 minute
\n" ); document.write( "..
\n" ); document.write( "1/20 -1/36 = (36-20) / 20*36
\n" ); document.write( "=16/20*36
\n" ); document.write( "=1/45 of the job he does alone
\n" ); document.write( "so he will take 45 minutes to do the job alone.
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