Question

Pipe A and B filled the tank in 3 hour and 1hour 45 mint.Another pipe C empty the tank in 1hour..If Pipe A,B,C open at 1pm,2pm and 3pm respectively then when the tank will be empty?
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Answer 1

Answer:

When pipes A and B work together an empty tank can be filled in 24 hours if after working 8 hours together B is closed but a remains open then this tank the filling will take a total of 28 hours a how long the tank alone?