A) \[10\,\,\min \]
B) \[9\frac{1}{4}\,\,\min \]
C) \[8\frac{1}{10}\,\,\min \]
D) \[8\frac{1}{4}\,\,\min \]
Correct Answer: D
Solution :
Work done by A and B in 3 min. \[=3\,\,(27\div 12\times 15)=\frac{9}{20}\] for doing \[\frac{1}{15}\text{th}\]work B takes 1 min for doing \[\frac{11}{20}\text{th}\] work B takes\[=\frac{11}{20}\times \frac{15}{1}=8\frac{1}{4}\,\,\min .\]You need to login to perform this action.
You will be redirected in
3 sec