# 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:

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by sashiMeda

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by sashiMeda

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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

=11/30

time taken by C to empty the tank=12hours

C's one hour work=1\12

=11\30--1/12

=17/60

=60/17

=3whole9/17