A pipe can fill a cistern in 20 minutes whereas the ciste... — Answer & Explanation | PrepBeePakistan

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MEDIUMENGLISHMathematics

A pipe can fill a cistern in 20 minutes whereas the cistern when fill can be emptied by a leak in 28 minutes. When both pipes are opened, find when the cistern will be full?

Correct answer: C

Explanation

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