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If two pipes P and Q are such that, they can fill a large tub in 6 and 18 minutes respectively. They are opened

If two pipes P and Q are such that, they can fill a large tub in 6 and 18 minutes respectively. They are opened on alternate minutes. Find in how many minutes, the tub shall be full? 1. 6 min. 2. 10 min. 3. 18 min. 4. 24 min. None of the above 5.

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