One pipe can fill a tank 6 times as fast as another pipe. If together the two pipes can fill the tank in 22 minutes, then the slower pipe alone will be able to fill the tank in:
164 min
154 min
134 min
144 min
Explanation:
Let faster pipe alone can fill the tank in $x$ minutes.
Then, slower pipe alone can fill the tank in $6x$ minutes.
$\dfrac{x×6x}{x+6x}=22\dfrac{6x}{7}=22x=\dfrac{22×7}{6}=\dfrac{154}{6}$
Time required for the slower pipe to fill the tank
=$6x=154$ minute.