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Q 2223645541.     Two pipes function simultaneously and fill a tank in 4 h.
One pipe, functioning alone, can fill up the tank 6 h faster
than the other. How much time will the faster pipe take to
fill the tank if it functions alone?
IBPS-CLERK 2017 Mock Prelims
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)