document.write( "Question 163802: Three workers set out to plaster a ceiling. One can do the job alone in 2 hours, one in three hours and the last in 4 hours how long does it take them together to plaster the ceiling? \n" ); document.write( "

Algebra.Com's Answer #120668 by edjones(8007) $\"\"$ $\"About$

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One can do 1/2 the job in 1 hr, another 1/3 and another 1/4 the job in 1 hr.
\n" ); document.write( "1/2 + 1/3 + 1/4
\n" ); document.write( "=6/12 + 4/12 + 3/12
\n" ); document.write( "=13/12 of the job in 1 hr together
\n" ); document.write( "12/13 of an hour to do the job working together.
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