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A can do 1//6 of a work in 5 days and B ...

A can do `1//6` of a work in 5 days and B can do 2/5 of the work in 8 days. In how many days can both A and B together do the work? (A) 12 days (B) 13 days (C ) 15 days (D) 20 days

A

C

B

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A

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B

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