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

Question

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 ?

Options:

A . 70 days

B . 120/7 days

C . 50 days

D . 45 days

Answer: Option B
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