'A' can complete a piece of work in 5 days and ' B ' can complete the same piece of work in 10 days. In how many days can 'A' and ' B ' together complete the same work ?

 'A' can complete a piece of work in 5 days and ' B ' can complete the same piece of work in 10 days. In how many days can 'A' and ' B ' together complete the same work ?

A). 25 days

B). 26 days

C). 28 days

D). 31 days

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