Q. A, B and C can do a piece of work in 30, 20 and 10 days respectively. A is assisted by B on one day and by C on the next day, alternately. How long would the work take to finish ?

• A. 4 7/8 days
• B. 8 4/13 days
• C. 3 9/13 days
• D. 9 3/8 days

Correct Answer: D