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N can do a piece of work in 80 days. He works at for 10 fdays and then M alone finishes the remaining work in 42 days. In how much time will N and M, working together , finish the work?

N can do a piece of work in 80 days. He works at for 10 fdays and then M alone finishes the remaining work in 42 days. In how much time will N and M, working together , finish the work? Correct Answer 30 days

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