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5. Pipes P and @ can fill a tank in, 10 and 12 hours respectively, and C can empty it in 6 hours., If all the three are opened at 7, a.m., at what time will one-fourth, of the tank be filled ?, , (1) 10 a.m. (2) 10 p.m., , (3) 11 p.m. (4) 11 a.m., (SSC CPO (SI, ASI & Intelligence, Officer) Exam. 28.08.2011 (Paper-I)
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3, , 6. If 5 th of a cistern is filled in 1, , minute, the time needed to fill, the rest is, , (1) 40 sec (2) 30 sec, , (3) 36 sec (4) 24 sec, , (SSC CHSL DEO & LDC, Exam. 28.10.2012 (Ist Sitting)
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4. A tap can fill an empty tank in, 12 hours and another tap can, empty half the tankin 10 hours., It both the taps are opened simultaneously, how long would it, take for the empty tank to be, filled to half its capacity ?, , (1) 30 hours (2) 20 hours, (3) 15 hours (4) 12 hours, , (SSC (South Zone) Investigator, Exam. 12.09.2010)
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20. A cistern is provided with two, pipes A and B. A can fill it in 20, minutes and B can empty it in, 30 minutes. If A and B be kept, open alternately for one minute, each, how soon will the cistern, be filled ?, , (1) 121 minutes (2) 110 minutes, (3) 115 minutes (4) 120 minutes, (SSC CGL Tier-I Re-Exam. (2013), 20.07.2014 (IInd Sitting)
