A) 15 days
B) 20 days
C) \[22\frac{1}{2}\]Days
D) 25 days
Correct Answer: C
Solution :
[c] If time taken by A be x days, Then time taken by B = 3x days \[\therefore \,\,\,3x-\,x=60\] \[\Rightarrow 2x-\,60\] \[\Rightarrow x=30\] Time taken by B=90 days \[\therefore \](A+B)'s 1 day's work \[=\frac{1}{30}+\frac{1}{90}=\frac{3+1}{90}=\frac{4}{90}=\frac{2}{45}\] \[\therefore \]The work will be completed in \[\frac{45}{2}i.e.\,\,22\frac{1}{2}\,\,days\]You need to login to perform this action.
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