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P and Q together can do a job in 6 days....

P and Q together can do a job in 6 days. Q and R can finish the same job in `(60)/(7)` days. P started the work and worked for 3 days. Q and R continued for 6 days. Then the difference of days in which R and P can complete the job is.

A

12

B

10

C

8

D

15

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