document.write( "Question 990815: Two painters were working on a house. Painter A can complete the given job in 8 hours but painter B takes 10 hourse. They worked together for the first four hours, but painter A left and told painter B to finish thejob. How long would it take for painter B to finish the job? \n" ); document.write( "
Algebra.Com's Answer #610826 by Edwin McCravy(20056)\"\" \"About 
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document.write( "The other tutor's answer is incorrect.\r\n" );
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\n" ); document.write( "Two painters were working on a house. Painter A can complete the given job in 8
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document.write( "Painter A's rate is 1 job per 8 hours or 1/8 job per hour\r\n" );
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\n" ); document.write( "but painter B takes 10 hours.
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document.write( "Painter B's rate is 1 job per 10 hours or 1/10 job per hour \r\n" );
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\n" ); document.write( "They worked together for the first four hours,
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document.write( "Their combined rate is 1/8 + 1/10 = 5/40 + 4/40 = 9/40 job per hour.\r\n" );
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document.write( "In those 4 hours at that rate they did 4(9/40) or 9/10 of the job.\r\n" );
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document.write( "So 1/10 of the job remained to be done.\r\n" );
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\n" ); document.write( "but painter A left and told painter B to finish the job.
\n" ); document.write( "How long would it take for painter B to finish the job?
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document.write( "Let the answer be x hours.  Then rate times time = the remaining 1/10\r\n" );
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document.write( "B's rate is 1/10 jobs per hour, so the equation is rate times time = 1/10.\r\n" );
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document.write( "              (1/10)(x) = 1/10\r\n" );
document.write( "                      x = 1 hour.\r\n" );
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document.write( "Edwin
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