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Pipes A and B can fill a tank in 5 and 6 hours respectively. Pipe C can empty it in 12 hours. If all the three pipes are opened together, then the tank

will be filled in:


Time taken by A to fill the tank=5hours
A's on hour work=1\5
time taken by B to fill the tank=6hours
B's one hour work=1/6
time taken by A and B to fill the tank=1/5+1\6
time taken by C to empty the tank=12hours
C's one hour work=1\12
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