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# Pipes and Cisterns Questions and Answers

**Pipes and Cisterns Aptitude Questions**

On this page we will be discussing about Pipes And Cistern Questions that are generally asked in placement Exams. Pipes and Cistern is a common topic asked in various companies exams. Two basic terminologies in Pipes and Cistern Topic are:

Inlet
A pipe which is used to fill water in a tank. This is considered as Positive work done

Outlet
A pipe which is used to empty the tank filled with water. This is considered as negative work done.

**Rules for Pipes and Cisterns**

- Inlet is referred to as the pipe which is supposed to fill the tank.
- A pipe that is meant to empty the tank is called as outlet.
- When a pipe works for x hours for filling up the cistern, then 1/x portion of the cistern will be completed in 1 hour.
- When a pipe works for y hours to empty the cistern, then the portion of the cistern emptied in 1 hour is equals to

= \frac{1}{y} - Pipe A might fill a cistern n times as quickly as another pipe B. This states that if slower pipe B works for x min to fill the empty tank,

then quicker pipe A works for x/n min to fill up the empty cistern. If they work collaboratively, then the portion of the cistern which is loaded up in 1 hour is

= \frac{n+1}{x} - In some scenarios the efficiency of the pipes would have been given such as in percentage, to find the actual rate multiply the efficiency percentage with rate.
- Be very careful when using Units make sure all the units are same, or else answer might get wrong.

## Formulas to keep in mind.

Time, Rate, and Volume Relationship:**Time = Volume / Rate****Rate = Volume / Time****Volume = Rate × Time**

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- Speed Time and Distance – Questions | Formulas | How to Solve Quickly | Tricks & Shortcuts
- Work and Time – Questions | Formulas | How to Solve Quickly | Tricks & Shortcuts
- Boats and Streams – Questions | Formulas | How to Solve Quickly | Tricks & Shortcuts

- Speed Time and Distance –

Questions |

Formulas |

How to Solve Quickly |

Tricks & Shortcuts - Work and Time –

Questions |

Formulas |

How to Solve Quickly |

Tricks & Shortcuts - Boats and Streams –

Questions |

Formulas |

How to Solve Quickly |

Tricks & Shortcuts