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A does (2)/(5) of a work in 9 days. Then...

A does `(2)/(5)` of a work in 9 days. Then B joined him and they together completed the remaining work in 6 days. B alone can finish the whole work in

A

`6 12/13`days

B

`8 2/11` days

C

10 days

D

18 days

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