Tom can lay bus route between twogiven bus stop in 16 days and Andy can do the same job in 12 days. With help of John, they did the job in 4 days only. Then, John alone can do the job in how many days?  Choose the correct choice: A) 9 1/5 B) 9 3/5 C) 9 5/7 D) 10 1/5 E) 10 3/5
(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	/5days.   5	5   9 3/5
<result>B</result>
Tom can lay bus route between twogiven bus stop in 16 days and Andy can do the same job in 12 days. With help of John, they did the job in 4 days only. Then, John alone can do the job in how many days?