A started a work and left after working ...

A started a work and left after working for 2 days. Then B was called and he finished the work in 9 days. Had A left the work after working for 3 days, B would have finished the remaining work in 6 days. In how many days can each of them, working , alone, finish the whole work? a. `2.5\ days ,\ 7. 5\ d a y s` b. `5\ d a y s ,\ 8. 5\ d a y s` c. `5\ d a y s ,\ 15\ d a y s` d. none of these

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