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A and B can fill a tank in 24 and 18 hrs respectively. Another pipe C can empty the full tank in 9 hours. The second pipe was also opened 1 hr after the first pipe was opened. It took 12 hrs to fill the tank because emptying pipe was also opened for some time. For how much time in hrs the emptying pipe was opened.

S Aptitude
A
B
C
D
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