Pipe and Cistern

Pipe and Cistern

 

Questions Asked from this Chapter:

 

Question Type 1: Based on basic concept of Pipe & Cistern

Example:
Two pipes can fill a cistern in 3 hours and 4 hours respectively and a waste pipe can empty it in 2 hours. If all the three pipes are kept open, the cistern will be filled in:
a) 5 hours
b) 8 hours
c) 10 hours 
d) 12 hours
Solution:
 

Question Type 2: Based on Fractions/ Part of Filled Tank

Example:
Pipes P & Q can fill a tank in 10 & 12 hours respectively and C can empty in 6 hours. If all the three are opened at 7:00 am. At what time will one-forth of the tank be filled?
a) 10 am
b) 10 pm
c) 11 pm
d) 11 am
Solution:
 

Question Type 3: Based on taps are opened alternatively or a leak in a Tank

Example:
A tank can be filled with water by two pipes A and B together in 36 minutes. If the pipe B was stopped after 30 minutes, the tank is filled in 40 minutes. The pipe B can alone fill the tank in:
a) 45 minutes
b) 60 minutes
c) 75 minutes
d) 90 minutes
Solution:
 
Example:
Two pipes A and B can fill a tank in 6 hours and 8 hours respectively. If both the pipes are opened together , then after how many hours should B be closed so that the tank is full in 4 hours?
a) 2/3
b) 1
c) 2
d) 8/3
Solution: