Test Preparation on Pipes and Cistern for Competitive Exam
Rate of Filling the tank by A and B in 1 minute=3+2=5 unit So, total time taken by Pipe (A+B)=60/5 =12 minutes Ans.
[Concept: First step-L.C.M=20,30=60 i.e total unit. now 60/20=3 unit per minutes tank filling by pipe A and 60/30=2 unit per minutes tank filling by pipe B.]
Three pipes A, B, and C can fill a tank in 15 minutes, 20 minutes, and 30 minutes respectively. The pipe C is closed 6 minutes before the tank is filled. At what time the tank will be full?
One filling pipe A is 5 times faster than second filling pipe B. If B can fill a cistern in 36 minutes, find the time when the cistern will be full if both fill pipes are opened together.
Pipe A can fill an empty tank in 30 hours while B can fill it in 45 hours. Pipe A and B are opened and closed alternatively i.e., first pipe A is opened, then B, again A and then B, and so on for 1 hour each time without any time-lapse. In how many hours the tank will be filled if it was empty, initially?
A cistern can be filled by two taps A and B coming from the same main pipeline in 20 and 30 minutes respectively. Both the taps are opened at the same time but due to partial closing of a valve in the main pipeline, tap A was supplying only 4/5th of its capacity and tap B, 5/6th of its capacity. After some time, the valve in the main pipeline was opened fully thereby enabling the two taps to supply at full capacity. It took another 5 minutes to fill the cistern completely. How long (approx) was it before the valve on the main pipeline opened?
A tank has three pipes. The first pipe can fill 1/2part of the tank in 1 hour and the second pipe can fill 1/3 part in 1 hour. The third pipe is for making the tank empty. When all the three pipes are open, 7/12th part of the tank is filled in 1 hours. How much time will the third pipe take to empty the completely filled tank?
Two taps can separately fill a tank in 12 min and 15 min. The first tap was replaced with a tap of double the radius and the second tap was replaced with a tap of half the radius. Now in what time will the tank get filled?
A bath can be filled by the cold water pipe in 20 minutes and by the hot water pipe in 30 minutes. A person leaves the bathroom after turning on both pipes simultaneously and returns at the moment when the bath should be full. Finding, however, that the waste pipe has been open, he now closes it. In 6 minutes more the bath is full. In what time would the waste pipe empty it?
A water tank can be filled by a tap in 30 minutes and another tap can fill it in 60 minutes. If both the taps are kept open for 5 minutes and then the first tap is closed, how long will it take for the tap to fill the remaining part of the tank?
Pipe A can fill a tank in 36 minutes and pipe B can fill it in 45 minutes. If both the pipes are opened to fill an empty tank, in how many minutes will it be full?
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