document.write( "Question 1101866: A man can do a job in 10 hours and his younger son can do it in 12 hours. After the father and his younger son have been working for 1 hour, the older son joins them, and the three completed the job in 3 more hours. How long will it take the older son to do the job?
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Algebra.Com's Answer #716496 by josgarithmetic(39618)\"\" \"About 
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Father and young son work together 1 hour.
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\n" ); document.write( "\n" ); document.write( "x, time for older son to do ONE job, working alone\r
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\n" ); document.write( "Simplify and solve for x.
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