Topics

A) 40 h |

B) 30 h |

C) 50 h |

D) 30 h |

Correct Answer:

A) 40 h |

Description for Correct answer:

Let the leak empties the full tank in x h then

Part emptied in 1 h by leak = \( \Large \frac{1}{x} \)

Part filled by inlet in 1 h = \( \Large \frac{1}{20} \)

According to the question.

\( \Large \frac{1}{20} \)+\( \Large \frac{1}{x} \)=\( \Large \frac{1}{40} \)

Therefore, \( \Large \frac{1}{x} \) = \( \Large \frac{1}{40} \)-\( \Large \frac{1}{20} \)

= \( \Large \frac{1-2}{40} \)= \( \Large - \frac{1}{40} \)

[Negative sign indicates emptying]

Clearly, leak will empty the full tank in 40 h

Part of solved Pipes and Cisterns questions and answers : >> Aptitude >> Pipes and Cisterns

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