A) 2 hrs 24 min | B) 2 hrs 44 min |

C) 1 hrs 24 min | D) 1 hrs 24 min |

Explanation:

Given that three athletes can complete one round around a circular field in 16, 24 and 36 min respectively.

Now, required time after which they met for the first time = LCM of (16, 24 & 36) min

Now, LCM of 16, 24, 36 = 144 minutes = 2 hrs 24 min.

A) 5 days | B) 10 days |

C) 20 days | D) 40 days |

A) 10 minutes | B) 15 minutes |

C) 12 minutes | D) 20 minutes |

Explanation:

Working efficiency of both typist together = 100/6 = 16.66%

Let the efficiency of first typist be x and second typist be (16.66 –x)

First typist for 4 minute + second tyoistfor 6 minute = 80% work

⇒4x + (16.66 –x) X 6 = 80%

⇒4x + 100% -6x = 80%,

⇒x = 10%

First typist typed 10% per minute, second typst typed (16.66 –10) = 6.66% per minute

Slowest is second typist complete whole job in 100/6.66 = 15.01 = 15 minute

A) 12 days | B) 10 days |

C) 8 days | D) 6 days |

Explanation:

Quantity of food = 200 X 31 = 6200 man-days

Till 27 days, quantity consumed = 27 X 200 = 5400 man-days

Remaining quantity = 6200 –5400 = 800 man days

Remaining soilders = 200 –120 = 80

Let remaining food will be sufficient for x days⇒5400 + 80x = 6200⇒x= 10 days

A) 12 | B) 13 |

C) 15 | D) 16 |

Explanation:

Given, 48 people can do a work in 17 days. So total work = 48 x 17 = 816

Work done by 48 people in 6 days = 288.

The remaining work = 816 - 288 = 528

After 6 days four workers left. So number of people working is 44

Total number of days required for 44 men to complete the remaining work = 528/44 = 12