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A water tank is (3/5)th full. Pipe A can fill the tank in 10 minutes and pipe B can empty it in 6 minutes.

A water tank is (3/5)th full. Pipe A can fill the tank in 10 minutes and pipe B can empty it in 6 minutes. If both the pipes are open, how long will it take to empty or fill the tank completely? 1. 6 minutes to empty 2. 6 minutes to fill 3. 9 minutes to empty 4. 9 minutes to fill 5. None of these

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