A can lay railway track between two given stations in 16 days and B can do the same job in 12 days. With help of C, they did the job in 4 days only. Then, C alone can do the job in:  Choices:
A) 9 1/5 days  B) 9 2/5 days  C) 9 3/5 days  D) 10  E) 15
Explanation:   (A + B + 9 3/5 days)'s 1 day's work =	1/4   A's 1 day's work =	1/16   B's 1 day's work =	1/12   9 3/5 days's 1 day's work =	1/4-(1/16+1/12)=5/48   So, 9 3/5 days alone can do the work in	48/5=9 3/5 days   ANSWER IS 9 3/5 days
<result>C</result>
A can lay railway track between two given stations in 16 days and B can do the same job in 12 days. With help of C, they did the job in 4 days only. Then, C alone can do the job in: