document.write( "Question 1064380: Jason and Hilger are required to paint over the graffiti on a wall.
\n" ); document.write( "If Jason worked alone, it would take him 20 hrs to repaint. Working
\n" ); document.write( "alone, Hilger could do the job in 15 hrs. How long will it take them
\n" ); document.write( "to do the painting If they work together? \n" ); document.write( "

Algebra.Com's Answer #679433 by Edwin McCravy(20055) $\"\"$ $\"About$

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Jason and Hilger are required to paint over the graffiti on a wall.
\n" ); document.write( "If Jason worked alone, it would take him 20 hrs to repaint. Working
\n" ); document.write( "alone, Hilger could do the job in 15 hrs. How long will it take them
\n" ); document.write( "to do the painting If they work together?
\n" ); document.write( "

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document.write( "Jason's working rate is 1 job in 20 hrs or 1/20 jobs per hour.\r\n" );
document.write( "Hilger's working rate is 1 job in 15 hrs or 1/15 jobs per hour.\r\n" );
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document.write( "Their combined rate = 1/20 + 1/15 = 3/60 + 4/60 = 7/60 jobs per hour.\r\n" );
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document.write( "(Number of jobs done) = (rate in number of jobs per hour) × (number of hours)\r\n" );
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document.write( "Number of jobs done = 1 job\r\n" );
document.write( "Rate in number of jobs per hour = 7/60\r\n" );
document.write( "Number of hours = x\r\n" );
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document.write( "(Number of jobs done) = (rate in number of jobs per hour) × (number of hours\r\n" );
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document.write( "                    1 = (7/60)(x)\r\n" );
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document.write( "Multiply both sides by 60 and solve for x\r\n" );
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document.write( "Edwin

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