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A cistern can be filled by two supply pipes in 20 minutes and 30 minutes respectively. but a waste pipe can empty it in an hour. Both the supply pipes were opened together to fill the empty cistern, but by mistake the waste pipe was also open. How much later was the waste pipe closed, if the cistern is filled in 14 minutes?
A tap can empty a tank in 30 min. A second tap can empty it in 45 min. If both the taps operate simultaneously, how much time is needed to empty the tank?
Pipe A can fill a tank in 12 hours and Pipe B can fill the tank in 18 hours. If both the pipes are opened on alternate hours and if pipe B is opened first, then in how much time (in hours) the tank will be full?
A pipe can fill a tank in x hours and another can empty it in y hours. They can together fill it in
A pump can fill a tank with water in 2 h. Because of a leak in the tank it was taking h to fill the tank. The leak can drain all the water off the tank in:
Having the same capacity 9 pipes fill up a swimming pool in 20 minutes. How many pipes of the same capacity are required to fill up the same swimming pool in 18 minutes?
Pipes X. Y and Z are connected to a water tank and the rate of flow of water is 44 L/h, 55 L/h and 49 L/h respectively. Pipe X and Y fill the tank while pipe Z empties the tank. If all the three pipes are opened simultaneously, the tank gets completely filled up in 14 h. what is the capacity of the tank?
A tank can be filled by two taps in 25 and 30 minutes resp. There is leakage in the tank which can empty the tank in 15 minutes. If the taps are turned on at same moment, what part of tank will remain unfilled at end of 120 minutes?
Three pipes P,Q and R can fill a tank in 4, 8 and 12 hr respectively. One additional pipe S can empty the tank in 10 hr. Then which of the following combination can fill the tank in the least time?
A tank has 3 pipes A, B and C. A and B can fill it in 3 hours and 4 hours respectively while C can empty it in 1 hour. If the pipes are opened at 3 p.m., 4p.m & 5 p.m. respectively, then find the time in which whole tank will be empty.
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Mar 21SSC & Railway