SSC CGL Tier-2 01-December-2016 Maths Question 13

Question 13

John does $$ \frac{1}{2} $$ piece of work in 3 hours, Joe does $$ \frac{1}{4} $$ of the remaining work in 1 hour and George finishes remaining work in 5 hours. How long would it have taken the three working together to do the work ?

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