A) 5 days
B) \[4\frac{1}{2}\] days
C) 3 days
D) 4 days
Correct Answer: D
Solution :
A can do 1 work in 10 days B can do 1 work in \[\frac{9\times 5}{3}\] days = 15 days C can do 1 work in \[\frac{8\times 3}{2}\] days = 12 days \[\therefore \] (A + B + C)'s one day work \[=\frac{1}{10}+\frac{1}{15}\,+\frac{1}{12}\,=\frac{6+4+5}{60}\,=\frac{15}{60}=\frac{1}{4}\] \[\therefore \] They will complete the work in 4 days.
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