A) 20 days
B) \[22\frac{1}{2}\] days
C) 25 days
D) 30 days
Correct Answer: B
Solution :
Let A can finish the whole work in x days. \[\therefore \] B can finish the same work in 3x days. According to question, \[3x-x=60\] \[\therefore \] \[x=30\,\,\text{days}\] \[\therefore \] A can finish the work in 30 days and B can finish the same work in 90 days. \[\therefore \] (A + B)?s one day's work \[=\frac{1}{30}+\frac{1}{90}=\frac{4}{90}\] \[\therefore \] (A + B)?s can finish the complete work in \[=\frac{90}{4}=22\frac{1}{2}\,\text{days}\text{.}\]You need to login to perform this action.
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