Pipes & Cisterns MCQs with answers Page - 3

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Q. A pipe fills a tank in 20 hours. Another pipe empties it in 30 hours. If both are opened together, in how many hours will the tank be filled?

  • (A) 40 hours
  • (B) 50 hours
  • (C) 60 hours
  • (D) 120 hours

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Q. Two pipes A and B can fill a tank in 15 and 20 hours respectively. How long will they take together?

  • (A) 6 hours
  • (B) 7 hours
  • (C) 8 hours
  • (D) 9 hours

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Q. A pipe can fill a tank in 8 hours and another pipe can empty it in 12 hours. If both are opened together, the tank will be filled in?

  • (A) 12 hours
  • (B) 18 hours
  • (C) 24 hours
  • (D) 48 hours

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Q. A pipe fills a tank in 6 hours and B fills it in 12 hours. If both are opened together, how long will they take?

  • (A) 3 hours
  • (B) 4 hours
  • (C) 5 hours
  • (D) 6 hours

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Q. A tank is filled by a pipe in 10 hours. Due to a leak, it takes 15 hours to fill. In how many hours can the leak empty the full tank?

  • (A) 20 hours
  • (B) 25 hours
  • (C) 30 hours
  • (D) 35 hours

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Q. Two pipes can fill a tank in 24 and 36 hours respectively. How long will they take to fill the tank together?

  • (A) 12 hours
  • (B) 14.4 hours
  • (C) 18 hours
  • (D) 20 hours

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Q. Pipe A can fill a tank in 16 hours. Pipe B can empty it in 24 hours. If both are opened together, the tank will be filled in?

  • (A) 24 hours
  • (B) 36 hours
  • (C) 48 hours
  • (D) 96 hours

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Q. A pipe can fill a tank in 9 hours and another can empty it in 18 hours. If both are opened together, the tank will be filled in?

  • (A) 9 hours
  • (B) 12 hours
  • (C) 18 hours
  • (D) 24 hours

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Q. Two pipes together can fill a tank in 8 hours. One of them alone can fill it in 12 hours. The other pipe can fill it in?

  • (A) 12 hours
  • (B) 16 hours
  • (C) 24 hours
  • (D) 48 hours

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Q. Three pipes A, B and C can fill a tank in 12, 15 and 20 hours respectively. How long will they take together?

  • (A) 4 hours
  • (B) 5 hours
  • (C) 6 hours
  • (D) 7 hours

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