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:

9 1 days 5
9 2 days 5
9 3 days 5
10

Correct Answer: 9 3 days 5

Explanation:

(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

∴ 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

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