A) 12 h
B) 21 h
C) \[6\frac{1}{2}\,h\]
D) (d)\[10\frac{1}{2}\,h\]
Correct Answer: B
Solution :
Let the leak empty the full tank in x h. \[\frac{1}{3}-\frac{1}{x}=\frac{2}{7}\] \[\Rightarrow \] \[\frac{1}{x}=\frac{1}{3}-\frac{2}{7}=\frac{7-6}{21}\] \[\Rightarrow \] \[\frac{1}{x}=\frac{1}{21}\] \[\Rightarrow \] \[x=21\,h\]You need to login to perform this action.
You will be redirected in
3 sec