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A can do 7/8 of work in 28 days, B can ...

A can do `7/8` of work in 28 days, B can do `5/6` of the same work in 20 days. The number of days they will take to complete if they do it together is

A

`15 (3)/(7)` days

B

`17 (3)/(5)` days

C

`14 (5)/(7)` days

D

`13 (5)/(7)` days

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