Question: Pipe A can fill a tank in 5 hours, pipe B in 10 hours and pipe C in 30 hours. If all the pipes are open, in how many hours will the tank be filled?

• 1. 2
• 2. 2.5
• 3. 3
• 4. 3.5

Question: A water tank is two-fifth full. Pipe A can fill a tank in 10 minutes and pipe B can empty it in 6 minutes. If both the pipes are open, how long will it take to empty or fill the tank completely?

• 1. 6 min. to empty
• 2. 6 min. to full
• 3. 9 min. to empty
• 4. 9 min. to full

Question: A tap can fill a tank in 6 hours. After half the tank is filled three more similar taps are opened. What is the total time taken to fill the tank completely?

• 1. 3 hrs 15 min
• 2. 3 hrs 45 min
• 3. 4 hrs
• 4. 4 hrs 15 min

Question: A cistern can be filled by a tap in 4 hours while it can be emptied by another tap in 9 hours. If both the taps are opened simultaneously, then after how much time will the cistern get filled?

• 1. 4.5 hrs
• 2. 5 hrs
• 3. 6.5 hrs
• 4. 7.2 hrs

Question: Two pipes A and B can fill a tank in 20 and 30 minutes respectively. If both the pipes are used together, then how long will it take to fill the tank?

• 1. 12 min
• 2. 15 min
• 3. 25 min
• 4. 50 min

Question: A tank is filled in eight hours by three pipes A, B and C. Pipe A is twice as fast as pipe B, and B is twice as fast as C. How much time will pipe B alone take to fill the tank?

• 1. 24 hours
• 2. 28 hours
• 3. 32 hours
• 4. 36 hours

Question: Pipe A can fill a tank in 6 hours. Due to a leak at the bottom, it takes 9 hours for the pipe A to fill the tank. In what time can the leak alone empty the full tank?

• 1. 16 hours
• 2. 15 hours
• 3. 18 hours
• 4. 17 hours

Question: Pipe A can fill a tank in 16 minutes and pipe B cam empty it in 24 minutes. If both the pipes are opened together after how many minutes should pipe B be closed, so that the tank is filled in 30 minutes?

• 1. 20
• 2. 24
• 3. 23
• 4. None of these

Question: Two pipes can fill a tank in 18 minutes and 15 minutes. An outlet pipe can empty the tank in 45 minutes. If all the pipes are opened when the tank is empty, then how many minutes will it take to fill the tank?

• 1. 12
• 2. 13
• 3. 11
• 4. 10

Question: Three pipes of same capacity can fill a tank in 8 hours. If there are only two pipes of same capacity, the tank can be filled in___________?

• 1. 17 hours
• 2. 12 hours
• 3. 16 hours
• 4. 24 hours