Nitin can do a piece of work in 7 hours. Pravin can do it in 21 hours. With the assistance of Rishi, they completed the work in 3 hours. In how many hours can Rishi alone do it?
A8
B7
C6
D9
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Working alone, A can do a job in 15 days and B can do the same job in 18 days. In how many days will the job be completed if both work together?