Correct option is D
Given:
A can do a piece of work = 20 days
B can do a piece of work = 10 days
(A+B+C) can do the work in 5 days
Concept Used :
Let Pipe A can fill the tank in x hrs.
Pipe A can fill a tank in 1 hrs =
Solution :
A's 1 day's work =
B's 1 day's work =
(A+B+C)'s 1 day's work =
Let, C can complete the work in = x days
C's 1 day's work =
According to question,
∴ C alone can complete the work in 20 days.