P can do a work in 15 days and Q can do the same job in 9 days. With the help of R, they did the job in 3 days only. Then, R alone can do the job in:

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P can do a work in 15 days and Q can do the same job in 9 days. With the help of R, they did the job in 3 days only. Then, R alone can do the job in: