# Pipes & Cisterns Practice Problems: Level 01

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Q.1.Pipe M and N running together can fill a cistern in 6 minutes. If M takes 5 minutes less than N to fill the cistern, then the time in which N alone can fill the cistern will be
a) 15 min
b) 10 min
c) 30 min
d) 25 min
Q.2. A cistern normally takes 10 hours to be filled by a tap but because of one open outlet pipe, it takes 5 hours more. In how many hours will the outlet pipe will empty a full cistern?
a) 20 hours
b) 24 hours
c) 30 hours
d) None of these
Q.3. Two pipes can fill a tank in 12 and 20 hours respectively. The pipes are opened simultaneously and it is found that due to leakage in the bottom, 30 minutes extra are taken for the cistern to be filled up. If the cistern is full, in what time would the leak empty it?
a) 120 hrs
b) 100 hrs
c) 115 hrs
d) 112 hrs
Q.4.Two pipes P and Q can fill a cistern in 36 and 48 minutes respectively. Both pipes are opened together, after how many minutes should Q be turned off,so that the cistern be fill in 24 minutes?
a) 6 min
b) 16 min
c) 10 min
d) 12 min
Q.5.Two pipes A and B can fill a tank in 20 and 16 hours respectively. Pipe B alone is kept open for 1/4 of time and both pipes are kept open for remaining time. In how many hours, the tank will be full?
a) 18 1/3 hrs
b) 20 hrs
c) 10 hrs
d) 12 1/4 hrs
Q.6.Two taps M and N can separately fill a cistern in 30 and 20 minutes respectively. They started to fill a cistern together but tap A is turned off after few minutes and tap B fills the rest part of cistern in 5 minutes. After how many minutes was tap M turned-off?
a) 9 min
b) 10 min
c) 12 mi
d) None of these
Q7.Three fill pipes A, B and C can fill separately a cistern in 12, 16 and 20 minutes respectively. A was opened first. After 2 minute, B was opened and after 2 minutes from the start of B, C was also opened. Find the time when the cistern will be full after opening of C?
a) 3 21/47 min
b) 4 1/2 min
c) 3 9 15/16 min
d) None of these
Q8.A cistern filled in 20 hours by three pipes A, B and C. The pipe C is twice as fast as B and B is thrice as fast as A. How much time will pipe A alone take to fill the tank?
a) 200 hrs
b) 205 hrs
c) 352 hrs
d) Cannot be determined
Q9.Three taps P,Q and R can fill a tank in 10,20 and 30hours respectively. If P is open all the time and Q and R are open for one hour each alternately, then the tank will be full in :
a) 6 hrs
b) 6.5 hrs
c) 7 hrs
d) 7.5 hrs
Q10.A tank has a leak which would empty it in 10 hours,a tap is turned on which admits 4 litre a minute into the tank and now it emptied in 12 hours.The capacity of the tank is:
a) 648 litres
b) 1440 litres
c) 1200 litres
d) 1800 litres
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