Outlet is a pipe connected with a tank or cistern or reservoir. It is used to empty the tank.
part of the tank filled in 1 hour If a pipe can empty a tank in hours,
part of the tank emptied in 1 hour
Suppose a pipe can fill a tank inhours and another pipe can empty the full tank in hours. We can examine two cases here.
net part filled in 1 hour
net part emptied in 1 hour
|Two pipes A and B can fill a cistern in 75/2 minutes and minutes respectively. Both pipes are opened. The cistern will be filled in just half an hour, if pipe B is turned off after|
|A. 5 min||B. 9 min|
|C. 10 min||D. 15 min|
Pipe A alone can fill the cistern in
So the remainingpart is filled by pipe B.
Pipe B can fill the cistern in 45 minutes. So, time required to fill
i.e., pipe B is turned off after 9 minutes.
Q. Two pipes P1 and P2 can separately fill a cistern in 20 and 30 minutes respectively and a waste pipe P3 can carry off 22 litres per minute. If all the pipes are opened when the cistern is full, it is emptied in 62 hours. How many litres does the cistern hold?
Q. A tap takes 24 hours extra to fill a tank due to a leakage equivalent to half of its inflow. The inflow can fill in how many hours?
Q. Pipes A and B can fill a cistern in 15 hours together. But if these pipes operate separately A takes 40 hours less than B to fill the tank. In how many hours the pipe A will fill the cistern working alone?
Q. Two pipes can fill a cistern in 15 minutes, 18 minutes respectively. These are opened alternately for 2 min each. In how much time will cistern be filled?
Q. pipe A can fill a tank in 45 minutes and pipe B can empty the tank in 60 minutes. Both pipes are used alternatively for 3 minute. How long will it take to fill the whole tank?