# IMO Level 1- Mathematics Olympiad (SOF) Class 8: Questions 574 - 580 of 1042

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## Question 574

### Question

MCQ▾A cistern has two inlets A and B which can fill it in 10 minutes and 20 minutes respectively. An outlet C can empty the full cistern in 4 minutes. If all the pipes are opened together in the empty tank, time taken to fill the tank completely is ________.

### Choices

Choice (4) | Response | |
---|---|---|

a. | 20 minutes | |

b. | 10 minutes | |

c. | 15 minutes | |

d. | 25 minutes |

## Question 575

## Question 576

### Question

MCQ▾A water tank is two-fifth full. Pipe A can fill a tank in 12 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?

### Choices

Choice (4) | Response | |
---|---|---|

a. | 5 minutes | |

b. | 4 minutes | |

c. | 5.5 minutes | |

d. | 4.8 minutes |

## Question 577

## Question 578

## Question 579

## Question 580

### Question

MCQ▾A man completes of a job in 12 days. At this rate how many more days will it take him to finish the job?

### Choices

Choice (4) | Response | |
---|---|---|

a. | 23 | |

b. | 27 | |

c. | 24 | |

d. | 26 |