One pipe: part of the tank and time 7 PYQs

• A pipe can fill a tank in 100 minutes. In how much time (in seconds) can it fill 80 percent of the tank?SSC GD 2026 · 05 May 2026
• A pipe can empty 1/3 part of a tank in 45 minutes. In how much time (in minutes) will it empty the complete tank?SSC GD 2026 · 08 May 2026
• A pipe can empty a tank in 36 minutes. In how much time (in minutes) can it empty 1/4 part of this tank?SSC GD 2026 · 25 May 2026
• A pipe can empty a tank in 48 minutes. In how much time (in minutes) can it empty 1/6 part of this tank?SSC GD 2026 · 09 May 2026
• A pipe can empty 1/4 part of a tank in 8 minutes. In how much time (in minutes) can it empty 1/2 part of that tank?SSC GD 2026 · 07 May 2026
• A pipe can empty 1/5 part of a tank in 36 minutes. In how much time (in minutes) will it empty the complete tank?SSC GD 2026 · 06 May 2026
• A tap fills a tank in 20 minutes. What part of the tank does it fill in 5 minutes?SSC Selection Post 2026 · 22 Sep 2026

Two or more filling pipes together 3 PYQs

• P and Q together can fill a cistern with water in 6 hours. If P alone can fill the cistern with water in 12 hours, then in how many hours will Q…RRB Group D 2026 · 08 Jan 2026
• Pipes A and B together can fill a cistern in 10 hours. Pipes B and C together can fill the same cistern in 20 hours, and pipes C and A together can…RRB NTPC 2026 · 08 May 2026
• Pipes, A and B, can fill a tank in 10 hours. Pipes, B and C, can fill the same tank in 20 hours. If pipe B alone can fill the same tank in 30 hours,…RRB NTPC 2026 · 19 Jun 2026

Faster and slower pipes, and many identical pipes 3 PYQs

• Pipe A can fill a tank three times as fast as another pipe B. If the two pipes working together can fill the tank in 36 minutes, then in what time…RRB 2026 · 18 Feb 2026
• A group of 8 pumps can fill a tank in 15 hours. After working for 5 hours, 4 more pumps are added. Find the total time required to fill the tank.SSC GD 2026 · 25 May 2026
• A tank is filled by three pipes, P, Q and R, with uniform flow. The first two pipes P and Q, operating simultaneously, fill the tank in the same…RRB NTPC 2026 · 18 Mar 2026

Inlet and outlet pipes together 5 PYQs

• A reservoir can be completely filled in 18 hours by an inlet pipe. A leakage pipe can empty the full reservoir in 36 hours. If both pipes are opened…UP Police Constable 2026 · 08 Jun 2026
• One pipe can fill a tank in 7 minutes while another pipe can empty the completely filled tank in 56 minutes. If both the pipes are opened together…RRB Group D 2026 · 02 Feb 2026
• Two taps can fill a cistern in 2 hours and 37 hours, respectively. A third tap can empty it in 37 hours. How long (in hours) will it take to fill…RRB NTPC 2026 · 07 May 2026
• Inlet M fills a tank in 24 minutes and Inlet N fills it in 32 minutes. Outlet O drains the tank. When all three operate simultaneously, the tank…RRB NTPC 2026 · 17 Jun 2026
• A cistern is filled by two taps, C and D, in 54 minutes and 81 minutes, respectively. There is also a drain E at the bottom. If all three are opened…RRB NTPC 2026 · 16 Jun 2026

Pipes opened late, closed after some time, or changing speed 4 PYQs

• An empty tank is connected to two inlet pipes. The first fills it in 12 hours and the second in 20 hours. If the second pipe is opened 4 hours after…UP Police Constable 2026 · 10 Jun 2026
• Three taps A, B and C can fill an overhead tank in 60 hours, 70 hours and 50 hours respectively. All three taps are opened for 10 hours and then B…UP Police SI 2026 · 15 Mar 2026
• A tank is filled by two pipes, A and B, and emptied by a third pipe C. Pipe A fills the tank in 10 hours and pipe B in 15 hours. Pipe C empties it…RRB NTPC 2026 · 14 Jun 2026
• Two pipes, A and B, can fill a tank in 20 minutes and 30 minutes, respectively. A waste pipe C can empty it in 60 minutes. All three are opened…RRB NTPC 2026 · 18 Jun 2026