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A can do piece of work in 30 days while B can do it in 40 days. In how many days can A and B working together do it ?

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A can do piece of work in 30 days while B can do it in 40 days. In how many days can A and B working together do it ?

A. 70 days
B. 120/7 days
C. 50 days
D. 45 days