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A and B can do a work in 12 days, B and ...

A and B can do a work in 12 days, B and C in 15 days and C and A in 20 days. If A, B and C work together, they will complete the work in :

A

5 days

B

`7frac(5)(6)` days

C

10 days

D

`15frac(2)(3)` days

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