A can do a half of certain work in 70 days and B one third of the same in 35 days. They together will do the whole work in.

 A can do a half of certain work in 70 days and B one third of the same in 35 days. They together will do the whole work in.

A). 420 days

B). 120 days

C). 105 days

D). 60 days

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