A) 6
B) 8
C) 9
D) 12
Correct Answer: B
Solution :
[b] Let the time after which the pipe A was stopped be x min. Then,\[\frac{x}{20}+\frac{18}{30}=1\]\[\Rightarrow \]\[\frac{3x+36}{60}=1\] \[\Rightarrow \] \[3x=60-36\]\[\Rightarrow \]\[x=8\min \] |
You need to login to perform this action.
You will be redirected in
3 sec