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unable to understand this at all Pipes A and C are fill pipes while Pipe B is a drain pipe of a tank. Pipe B empties the full tank in one hour less than the time taken by Pipe A to fill the empty tank. When pipes A, B and C are turned on together the empty tank us filled in two hours, if b and c turned on together when the tank is empty and pipe b is turned off after one hour then pipe c take another one hour and 15 minutes to fill remaining tank. if pipe a can fill the empty tank in less than 5 hours then time taken by c to fill the empty tank in mins is?

unable to understand this at all Pipes A and C are fill pipes while Pipe B is a drain pipe of a tank. Pipe B empties the full tank in one hour less than the time taken by Pipe A to fill the empty tank. When pipes A, B and C are turned on together the empty tank us filled in two hours, if b and c turned on together when the tank is empty and pipe b is turned off after one hour then pipe c take another one hour and 15 minutes to fill remaining tank. if pipe a can fill the empty tank in less than 5 hours then time taken by c to fill the empty tank in mins is?