To fill a cistern, pipes P, Q & R take 20, 15 & 12 minute... — Answer & Explanation | PrepBeePakistan

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MEDIUMENGLISHMathematics

To fill a cistern, pipes P, Q & R take 20, 15 & 12 minutes respectively. The time in minutes that the three pipes together will take to fill the cistern is:__________?

Correct answer: A

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