Mechanical Engineering > Gate 2019 Set-2 > Verbal
Two pipes P and Q can fill a tank in 6 hours and 9 hours respectively, while a third pipe R
can empty the tank in 12 hours. Initially, P and R are open for 4 hours. Then P is closed
and Q is opened. After 6 more hours R is closed. The total time taken to fill the tank (in
hours) is ____.
Correct : b
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