Mathematics · Pipes and Cisterns
Pipes A and B can fill an empty tank in 45 minutes and 63 minutes respectively, while pipe C can empty the full tank in 54 minutes. When the tank was empty, initially only the two inlet pipes A and B were opened. After a while, pipe B was closed and simultaneously pipe C was opened. From the time the two inlet pipes were initially opened, it took a total of 75 minutes to fill the tank completely. For how many minutes was pipe B kept turned on?
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