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A can do frac(1)(3)rd of a work in 5 day...

A can do `frac(1)(3)rd` of a work in 5 days, B can do `frac(2)(5)` of work in 10 days, A and B together do the work in how many days?

A

`7frac(3)(8) days`

B

`8frac(4)(5) days`

C

`9frac(3)(8) days`

D

10 days

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