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10/12/2015 Bankers Adda: Gateway to SBI Mains: Concept and Quiz on Pipe and Cisterns
http://www.bankersadda.com/2015/06/gatewaytosbimainsconceptandquiz.html 1/5
TUESDAY, 16 JUNE 2015
Gateway to SBI Mains: Concept and Quiz onPipe and CisternsNature of Pipe : Inlet: A pipe connected with a tank or reservoir for filling is called as inletOutlet: A pipe connected with a tank and used for empties it is called outlet.Concept:If a pipe can fill a tank in x hours, then the part filled in 1 hour = 1 / x
If a pipe can fill a tank in x hours and another pipe can empty the full tank iny hours, then the net part filled in 1 hour, when both the pipes are opened: (1/x1/y)Time taken to fill the tank, when both the pipes are opened: (x×y / yx)
If a pipe can fill a tank in x hours and another fill the same tank in y hours,then the net part filled in 1 hr, when both pipes are opened: (1/x+1/y)So time to fill the tank will be: [x×y/(x+y)]
If a pipe fills a tank in x hrs and another fills the same tank in y hrs, but athird empties the full tank in z hrs and all of them are opened together, thenet part filled in 1 hr: (1/x+1/y1/z)So time taken to fill the tank: xyz/(yz+xzxy)
Practice questions:1). Two pipes A & B can fill a tank in 36 hours and 45 hoursrespectively. If both the pipes are open simultaneously. How muchtimes will be taken to fill the tank? A) 15 hourB) 25 hourC) 20 hourD) 30 hourE) None of these
2) If A & B two pipes can fill a tank in 10 hour, when A pipe can fill atank in 6 hour alone ,then in how much time will be taken to fill/emptythe tank when pipe B open alone ?A) Filled in 20 hrB) Empty in 15 hrC) Empty in 20 hrD) Filled in 15 hrE) None of these
3) Pipe A and B can fill a tank in 10 hour and 12 hour respectively butpipe C can empty the same tank in 15 hour, In how much time it willtake fill the tank when the three pipes are opened together? A) 8.5 hourB) 10 hourC) 12 hourD) 15 hourE) None of these
4) Two pipes A & B fill an empty tank in 40 minutes and 60 minutesrespectively, If both pipes are open simultaneously after how much timeshould A be closed so that tank is filled in 36 minutes? A) 36 minB) 20 minC) 25 minD) 16 minE) None of these.
5) Three taps A,B and C together can fill an empty tank in 4 hours, After1hour , C is closed and the tank is filled in 6 more hours. Find the timein which C alone can fill the empty tank?A) 18 hourB) 10 hour
C) 12 hourD) 15 hourE) None of these.
6) Two pipe p1 and p2 can fill a tank in 40 minutes and 60 minutes
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10/12/2015 Bankers Adda: Gateway to SBI Mains: Concept and Quiz on Pipe and Cisterns
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6) Two pipe p1 and p2 can fill a tank in 40 minutes and 60 minutesrespectively, both the taps are opened and after 10 minutes P1 was shut.In how much more time would the tank would be fill ?A) 35 minutesB) 45 minutesC) 40 minutesD) 50 minutesE) None of these.
7) Three taps A,B and C can fill a tank in 20,30 and 40 minutesrespectively. All the taps are opened simultaneously and after 5minutes tap A was closed and then after 6 minutes tab B was closed .Atthe moment a leak developed which can empty the full tank in 60minutes. What is the total time taken for the completely full? A) 44 minutesB) 25 minutesC) 35 minutesD) 24 minutesE) None of these
8) Pipe A can fill the tank in half the time in which Pipe B can fill thesame tank. If both the pipes are open simultaneously .it takes 8 hour tofill the tank .In how many hours can A alone fill the tank?A) 12 hourB) 10 hourC) 8 hourD) 15 hourE) None of these
9) Three taps P,Q and R can individually fill a cistern in 7, 14 and 21hours respectively .Tap P is opened first for 1 hour and then Tap P isclosed and Tap Q is opened for 1hour, tap Q is then closed and Tap R isthen opened for 1 hour after which Tap R is closed and Tap P openedagain. This Process is continued till the tank is full. In how much timewill the tank be completely full ?A) 11 hour B) 12 hourC) 13 hourD) 14 hourE) None of these.
10) There are three taps A,B, and C. A takes thrice as much time as Band C together to fill the tank . B takes twice as much time as A and Cto fill the tank. In how much time can the Tap C fill the tank individually,if they would require 10 hours to fill the tank, When openedsimultaneously ?A) 14 hourB) 25 hourC) 15 hourD) 20 hourE) None of these.
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Answers1) C2) B3) A4) D5) E6) A7) D8) A9) A10)E
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