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:
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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=5.4161244848
So, C alone can do the work in48= 93days
your answer is - -
(A+B+C) 1 days work= 1, 4
As 1 day work=1/16
Bs 1 day work=1/14
Cs 1 day work=5.41
so, c alone can do in 93 days