Two pipes A and B can fill a tank in 15 min and 20 min re... — Answer & Explanation | PrepBeePakistan

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MEDIUMENGLISHMathematics

Two pipes A and B can fill a tank in 15 min and 20 min respectively. Both the pipes are opened together but after 4 min, pipe A is turned off. What is the total time required to fill the tank?

Correct answer: D

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