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Question
One pipe can fill a tank three times as fast as another pipe. If together the two pipes can fill the tank in 36 minutes, then the slower pipe alone will be able to fill the tank in :
81 min
108 min
144 min
192 min
ANSWER : 3
Descrption
<p style="margin-left:0px;">Let the slower pipe alone fill the tank in x min<br>Then, faster pipe will fill it in x/3 min<br><br>So, slower pipe in 1 minute can fill = 1/x part of the tank<br>and faster pipe in 1 minute can fill = 3/x part of the tank<br>again, together in 1 minute can fill = 1/36 part of the tank<br><br>As per question,<br>1/x + 3/x = 1/36<br>∴ x = 144 min (Ans:)</p>
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