A) 15 minutes
B) 10 minutes
C) 5 minutes
D) 9 minutes
Correct Answer: D
Solution :
Pipe \[A\] fills the tank in \[\frac{75}{2}\]minutes. \[\therefore \]Part of the tank filled by A in 30 minutes\[=\frac{2}{75}\times 30=\frac{4}{5}\] Remaining part\[=1-\frac{4}{5}=\frac{1}{5}\] Now, 1 part is filled by pipe B in 45 minutes \[\therefore \] \[\frac{1}{5}\]part is filled in \[=45\times \frac{1}{5}=9\]minutes Hence, the pipe B should be turned off after 9 minutes.You need to login to perform this action.
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