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Q 2472078836.     One fill pipe A takes 3 minutes more to fill the cistern than two fill pipes A and B opened together to fill it. Second
fill pipe B takes `21 1/3` minutes more to fill cistern than two fill pipes A and B opened together to fill it.
When will the cistern be full if both pipes are opened simultaneously.
IBPS-CLERK 2016 Mains 2001
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)