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A can complete 1/3 of a work in 5 days a...

A can complete `1/3` of a work in 5 days and B, `2/5` of the work in 10 days. In how many days both A and B together can complete the work? a. `7 1/2` b. `9 3/8` c. `8 4/5` d. `10`

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