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A can complete a work in 16 days, B in 1...

A can complete a work in 16 days, B in 12 days and C in l5 days. All of them began the work together, but A had to leave the work after 2 days of the start and B 3 days before the completion of the work. How long did the work last?

A

`4.5 days`

B

`6 days`

C

`9.5 days`

D

`12 days`

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