Question 1167051
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John can build {{{highlight(cross(pegpin))}}} pig-pen twice as fast as Ruel. Working together, it takes them 5 hours.
How long would it have taken John working alone?
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It means that in 5 hours, John makes {{{2/3}}}  of the job.


Hence, it will take John 2.5 hours to make  {{{1/3}}}  of the job.


Therefore, John can complete the entire job in  3*2.5 hours = 7.5 hours = 7 hours and 30 minutes working alone    <U>ANSWER</U>
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Solved.