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UGC NET Exam  >  UGC NET Questions  >  Pipe A can fill the tank in 6 hours and with ... Start Learning for Free
Pipe A can fill the tank in 6 hours and with help of B both can fill the tank in 12 hours. If both pipes opened together after how many hours should pipe B be closed so that the tank is filled in 8 hours?
  • a)
    2 hours
  • b)
    4 hours
  • c)
    6 hours
  • d)
    8 hours
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
Pipe A can fill the tank in 6 hours and with help of B both can fill t...
Work = 1/Efficiency
Calculation:
⇒ Pipe A can fill the tank in 6 hours, and Pipe A and B together can fill the tank in 12 hours.
⇒ Pipe B can empty the tank = 1/(1/12 – 1/6) = -12 hours
⇒ In 8 hours A will fill tank = 8/6 = 4/3
⇒ A will fill the extra water = 1 – 4/3 = -1/3
⇒ This extra water will be removed by pipe B in = (-1/12)/(-1/3) = 1/4
⇒ B will be closed after  4 hours
∴ The required result will be 4 hours.
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Pipe A can fill the tank in 6 hours and with help of B both can fill the tank in 12 hours. If both pipes opened together after how many hours should pipe B be closed so that the tank is filled in 8 hours?a)2 hoursb)4 hoursc)6 hoursd)8 hoursCorrect answer is option 'B'. Can you explain this answer?
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Pipe A can fill the tank in 6 hours and with help of B both can fill the tank in 12 hours. If both pipes opened together after how many hours should pipe B be closed so that the tank is filled in 8 hours?a)2 hoursb)4 hoursc)6 hoursd)8 hoursCorrect answer is option 'B'. Can you explain this answer? for UGC NET 2025 is part of UGC NET preparation. The Question and answers have been prepared according to the UGC NET exam syllabus. Information about Pipe A can fill the tank in 6 hours and with help of B both can fill the tank in 12 hours. If both pipes opened together after how many hours should pipe B be closed so that the tank is filled in 8 hours?a)2 hoursb)4 hoursc)6 hoursd)8 hoursCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for UGC NET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Pipe A can fill the tank in 6 hours and with help of B both can fill the tank in 12 hours. If both pipes opened together after how many hours should pipe B be closed so that the tank is filled in 8 hours?a)2 hoursb)4 hoursc)6 hoursd)8 hoursCorrect answer is option 'B'. Can you explain this answer?.
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