A) 10 days
B) 20 days
C) 11 days
D) 15 days
Correct Answer: D
Solution :
B's 1 day's work \[=\frac{1}{12}-\frac{1}{20}=\frac{5-3}{60}=\frac{1}{30}\] \[\therefore \] B's \[\frac{1}{2}\] day's work \[=\frac{1}{60}\] \[\therefore \] (A + B)'s 1 day's work \[=\frac{1}{20}+\frac{1}{60}=\frac{3+1}{60}=\frac{1}{15}\] B works for half day daily \[\therefore \] The work will be completed in 15 daysYou need to login to perform this action.
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