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) 16hours | B) 9hours |

C) 10hours | D) 15hours |

0
355

2
287

0
252

Q:

A) 1 hour | B) 1 hour 15 minutes |

C) 1 hour 25 minutes | D) 1 hour 30 minutes |

1
344

Q:

A) 1 hour | B) 45 minutes |

C) 30 minutes | D) 50 minutes |

0
323

Q:

A) 2h 30 min | B) 2h |

C) 3h | D) 2h 40 min |

2
451

0
368

Q:

A) 1 hour | B) 1 hour 30 min |

C) 1 hour 20 min | D) 1 hour 15 min |

3
486