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? Answers
A) 9
B) 9 3/5
C) 10
D) 11
E) None of these
(A + B + C)'s 1 day's work =	1	,   4   A's 1 day's work =	1	,   16   B's 1 day's work =	1	.   12   Therefore C's 1 day's work =	1	-	(	1	+	1	)	=	(	1	-	7	)	=	5	.   4	16	12	4	48	48   So, C alone can do the work in	48	= 9	3	days.   5	5   Answer is 9 3/5
<result>B</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?