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Q 1679180016.     `A` and `B` are two taps which can fill a tank
individually in `10` min and `20` min, respectively.
However, there is a leakage at the bottom, which
can empty a filled tank in `40` min. If the tank is
empty initially, then how much time will both the
taps take to fill the tank with leakage'?
CDS 2015 Paper-2
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)