Pipes a and b can complete a water tank in 4 hours and 5 hours respectively.a pipe c can empty a tank filled completely with water in 3 hours. initially,the tank is empty and all pipes are closed. pipe a is opened first at time t=0 and pipe c is opened at the instant when the tank is exactlly half filled with water.pipe b is opened after pipe c and at the instant when the tank is exactlly one - fourth filled with water.find the total time taken to fill the tank completely counting from t=0.
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