Time and Work on Arithmetic Aptitude related Questions and Answers

Question :   A can do a job in 16 days, and B can do the same job in 12 days. With the help of C, they did the job in 4 days. Then, C alone can do the job in 1. 12 3/5 days 2. 8 3/5 days 3. 10 3/5 days 4. 9 3/5 days Answer :   4 - 9 3/5 days