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Question 1
Two pipes A and B can fill a tank in 6 and 8 hours respectively. Both pipes are opened together. Pipe B is turned off after some time. Then tank is full in 4 hrs. For how long B was kept opened?
Question 2
Two pipes A and B can fill a tank in 10 minutes and 20 minutes respectively. A third pipe C can empty the tank in 15 minutes. First A and B are opened for 4 minutes and after that pipe C is also opened. Total time (in minutes) in which the tank will be filled up is
Question 3
Two pipes A and B fill a tank in 12 and 15 minutes respectively. Both are opened and at the of 3 minutes, A is turned off. How much time will B take to fill the remaining amount?
Question 4
Taps A and B fill a tank in 10 and 15 hours respectively and a tap C can empty it in 20 hrs. If all the taps are opened together alternatively (each for an hour) in order A, B and C respectively. In how many hours will the tank be filled completely?
Question 5
A cistern can be filled by three pipes A, B and C alone in 12 hrs, 24 hrs and 48 hrs respectively. There is an opening D in the cistern that empties the cistern at the rate of 6m/h. If the cistern is 96 m deep then, in how much time will it be filled upto 72m of its depth if all the pipes are opened together at the start but B is closed after an hour.
Question 6
A cistern is normally filled in 8 hrs, but take 2 hrs longer to fill because of a leak in its bottom. If the cistern is full, the leak will empty it in:
Question 7
Two pipes A and B together can fill a cistern in 4 hours. Had they been opened separately, then B would have taken 6 hours more than A to fill the cistern. How much time will be taken by A to fill the cistern separately?
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Mar 21SSC & Railway
