Q:

A) 60 gallons | B) 100 gallons |

C) 120 gallons | D) 180 gallons |

Answer: C) 120 gallons

Explanation:

Explanation:

Work done by the waste pipe in 1 minute =$\frac{1}{15}-\left(\frac{1}{20}+\frac{1}{24}\right)=\frac{1}{15}-\frac{11}{120}=-\frac{1}{40}$ [-ve sign means emptying]

Volume of $\frac{1}{40}$part = 3 gallons

Volume of whole = (3 x 40) gallons = 120 gallons.

Q:

A) 49 hours | B) 38.5 hours |

C) 42 hours | D) 45.5 hours |

2
280

Q:

A) 3 hours | B) 7.5 hours |

C) 6 hours | D) 9 hours |

0
479

1
336

2
298

0
329

0
390

Q:

A) 90 hrs | B) 86 hrs 40 min |

C) 45 hrs | D) 86 hrs 48 min |

0
371

Q:

A) 4 hrs 25 min | B) 4 hrs 15 min |

C) 4 hrs 40 min | D) 4 hrs |

1
588