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Pipes A and B can fill a tank in 12 min and 16 min respectively. Both are kept open for 'N' min and then B is closed and A fills the rest of the tank in 5 min. The time 'N' after which B was closed is:

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Pipes A and B can fill a tank in 12 min and 16 min respectively. Both are kept open for 'N' min and then B is closed and A fills the rest of the tank in 5 min. The time 'N' after which B was closed is:






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