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

• A. 24 days
• B. 30 days
• C. 36 days
• D. 20 days

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Answer: Option B

Explanation: