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A cistern has two taps (which fill it in 12 mins and 15 mins respectively) and an exhaust tap. When all the three taps are opened together, it takes 20 min to fill an emty cistern. How long will the exhaust tap take to empty it?
  • a)
    20 min
  • b)
    16 min
  • c)
    12 min
  • d)
    10 min
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
A cistern has two taps (which fill it in 12 mins and 15 mins respectiv...
Let Tap A can fill the cistern in 12 mins.
Let Tap B can fill the cistern in 15 mins.
Let Tap C can empty the cistern in x mins.
∴ 1/12 + 1/15 - 1/x = 1/20
⇒ x = 10
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A cistern has two taps (which fill it in 12 mins and 15 mins respectively) and an exhaust tap. When all the three taps are opened together, it takes 20 min to fill an emty cistern. How long will the exhaust tap take to empty it?a)20 minb)16 minc)12 mind)10 minCorrect answer is option 'D'. Can you explain this answer?
Question Description
A cistern has two taps (which fill it in 12 mins and 15 mins respectively) and an exhaust tap. When all the three taps are opened together, it takes 20 min to fill an emty cistern. How long will the exhaust tap take to empty it?a)20 minb)16 minc)12 mind)10 minCorrect answer is option 'D'. Can you explain this answer? for Railways 2024 is part of Railways preparation. The Question and answers have been prepared according to the Railways exam syllabus. Information about A cistern has two taps (which fill it in 12 mins and 15 mins respectively) and an exhaust tap. When all the three taps are opened together, it takes 20 min to fill an emty cistern. How long will the exhaust tap take to empty it?a)20 minb)16 minc)12 mind)10 minCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Railways 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A cistern has two taps (which fill it in 12 mins and 15 mins respectively) and an exhaust tap. When all the three taps are opened together, it takes 20 min to fill an emty cistern. How long will the exhaust tap take to empty it?a)20 minb)16 minc)12 mind)10 minCorrect answer is option 'D'. Can you explain this answer?.
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