1 . In a factory there are 3 machines to perform a job. The newest machine can do the job in 3 days, another machine can do it in 4 days, and the third machine can do it in 6 days. How many days will the factory take to do the job using all three machines together?

• A. 1.333
• B. 4.333
• C. 6
• D. 13
• D. None of these

Answer: Option A

Explanation: