# Aptitude - Pipes and Cistern

Exercise : Pipes and Cistern - Data Sufficiency 2

- Pipes and Cistern - Formulas
- Pipes and Cistern - General Questions
- Pipes and Cistern - Data Sufficiency 1
- Pipes and Cistern - Data Sufficiency 2

*Directions to Solve*

Each of the questions given below consists of a question followed by three statements. You have to study the question and the statements and decide which of the statement(s) is/are necessary to answer the question.

1.

If both the pipes are opened, how many hours will be taken to fill the tank? | |

I. | The capacity of the tank is 400 litres. |

II. | The pipe A fills the tank in 4 hours. |

III. | The pipe B fills the tank in 6 hours. |

Answer: Option

Explanation:

II. Part of the tank filled by A in 1 hour = |
1 |

4 |

III. Part of the tank filled by B in 1 hour = |
1 |

6 |

(A + B)'s 1 hour's work = | 1 | + | 1 | = | 5 | ||

4 | 6 | 12 |

A and B will fill the tank in | 12 | hrs = 2 hrs 24 min. |

5 |

So, II and III are needed.

Correct answer is (B).

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