Two pipes A and B can fill a tank in 4 and 5 hours respec... — Answer & Explanation | PrepBeePakistan

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MEDIUMENGLISHMathematics

Two pipes A and B can fill a tank in 4 and 5 hours respectively. If they are turned up alternately for one hour each, the time taken to fill the tank is?

Correct answer: B

Explanation

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