document.write( "Question 1132152: Dan can do the job in 30 hours, Ellen can do it in 40 hours, and Francis can do it in 60 hours. How long would it take them if they work together? (use only one variable)(thanks in advance) \n" ); document.write( "

Algebra.Com's Answer #749081 by Alan3354(69443) $\"\"$ $\"About$

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Dan can do the job in 30 hours, Ellen can do it in 40 hours, and Francis can do it in 60 hours. How long would it take them if they work together?
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\n" ); document.write( "h hours.
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\n" ); document.write( "1/h = 1/30 + 1/40 + 1/60
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