A can lay railway track between two stations in 16 days and B can do same work in 12 days. With the help of C, they completed the work in 4 days only. How much time C alone will take to complete the work
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Step-by-step explanation:
a = 1/16
b = 1/12
a +b+ c =1/4
c = a+b+ c - (a +b)
= 1/4 - (1/16+1/12)
=1/4 - ( 7/48)
= 12-7/48
=5/48
=48/5 = 9 3/5 days
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