A) 22
B) 221
C) 23
D) 231
Correct Answer: B
Solution :
If A completed the work in x days, B will do the same in 3x days \[\therefore \] \[3x-x=60\] \[\Rightarrow \] \[2x=60\] \[\Rightarrow \] \[x=30\] and \[3x=90\] \[\therefore \] (A + B)?s 1 day s work \[=\frac{1}{30}+\frac{1}{90}=\frac{3+1}{90}\] \[=\frac{4}{90}=\frac{2}{45}\] \[\therefore \] A and B together will do the work in \[\frac{45}{2}=22\frac{1}{2}\,\text{days}\text{.}\]You need to login to perform this action.
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