Math MCQs with answers Page - 399

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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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Q. A pipe can fill a tank in 25 hours. Another pipe empties it in 50 hours. If both are opened together, how long will it take to fill the tank?

  • (A) 25 hours
  • (B) 33.33 hours
  • (C) 50 hours
  • (D) 75 hours

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Q. Pipe A can fill a tank in 30 hours. Pipe B can fill it in 60 hours. Pipe C empties it in 20 hours. If all are opened together, the tank will be filled in?

  • (A) 30 hours
  • (B) 60 hours
  • (C) No filling
  • (D) 120 hours

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Q. Two inlet pipes can fill a tank in 6 and 8 hours respectively. An outlet pipe can empty it in 12 hours. How long will the tank take to fill if all pipes are opened?

  • (A) 4 hours
  • (B) 5 hours
  • (C) 6 hours
  • (D) 8 hours

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Q. A tank can be filled by two pipes in 10 and 15 hours respectively. Due to a leak, the tank takes 30 hours to fill. In how many hours can the leak empty the full tank?

  • (A) 20 hours
  • (B) 30 hours
  • (C) 60 hours
  • (D) 45 hours

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Q. Pipe A fills a tank in 5 hours and pipe B empties it in 10 hours. If both are opened together, how long will it take to fill the tank?

  • (A) 5 hours
  • (B) 10 hours
  • (C) 15 hours
  • (D) No filling

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Q. Two pipes can fill a tank in 4 hours and 6 hours respectively. If both are opened for 2 hours and then the faster pipe is closed, how much time will the slower pipe take to fill the remaining tank?

  • (A) 1 hour
  • (B) 2 hours
  • (C) 3 hours
  • (D) 4 hours

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Q. Pipe A can fill a tank in 7 hours and pipe B can empty it in 14 hours. If both are opened together, the tank will be filled in?

  • (A) 7 hours
  • (B) 10.5 hours
  • (C) 14 hours
  • (D) 21 hours

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Q. A pipe fills a tank in 18 hours. Due to a leak at the bottom, it is filled in 24 hours. In how many hours can the leak empty the tank?

  • (A) 48 hours
  • (B) 72 hours
  • (C) 36 hours
  • (D) 24 hours

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Q. Two pipes fill a tank in 20 hours and 30 hours respectively. If both are opened together, after how many hours will half the tank be filled?

  • (A) 6 hours
  • (B) 7.5 hours
  • (C) 8 hours
  • (D) 10 hours

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