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Two pipes A and B can separately fill a tank in 12 mins and 15 mins, respectively. Both the pipes are opened together but 4 mins after the start the pipe A is turned off. How much time will a take to fill the tank?

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Important Questions on Arithmetic Maths

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Police Constables>Chapter 3 - Arithmetic Maths>PIPES - CISTERNS>Q 3

Two Pipes P and Q can fill a cistern in 12 and 15 minute respectively. Both the opened together but at the end of 3 minute the first is turned off. How much longer will the cistern take to fill.

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Police Constables>Chapter 3 - Arithmetic Maths>PIPES - CISTERNS>Q 4
A cistern has a leak which would empty the cistern in 20 minutes. A tap is turned on which admits 4 litres a minute into the cistern, and it is now emptied in 24 minutes. How many litres does the cistern hold?
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Police Constables>Chapter 3 - Arithmetic Maths>PIPES - CISTERNS>Q 5
Two pipes can separately fill a cistern in 10 minutes and 15 minutes respectively. When the waste pipe is opened,they can together fill it in 18 minutes. The waste pipe can empty the full cistern in?
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Police Constables>Chapter 3 - Arithmetic Maths>PIPES - CISTERNS>Q 6
A cistern filled by a tap in 312 hours. Due to leak in the bottom of the cistern, it takes half an hour longer to fill the cistern. If the cistern is full how long will the leak take to empty it?
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Police Constables>Chapter 3 - Arithmetic Maths>PIPES - CISTERNS>Q 7
A cistern has three pipes A,B and C. The pipes A and B can fill in 4 and 5 hours respectively and C can empty it in 2 hours. If the pipes are opened in order at 1, 2 and 3 pm. When will the cistern be empty.
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Police Constables>Chapter 3 - Arithmetic Maths>PIPES - CISTERNS>Q 8
Two pipes A and B can fill a tank in 4 hours and 5 hours respectively. If they are turned up alternately for one hour each. If A starts, the time taken to fill the tank is:
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Police Constables>Chapter 3 - Arithmetic Maths>PIPES - CISTERNS>Q 9
Two pipes A and B can fill a cistern in 12 min and 15 min respectively. Both are open together but after 3 minutes A is turned off. After how much more time will the cistern be filled?
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Police Constables>Chapter 3 - Arithmetic Maths>PIPES - CISTERNS>Q 10
A cistern is normally filled in 8 hours but takes two hours longer to fill because of a leak in its bottom. If the cistern is full, the leak will empty it in: