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     EduGorilla 
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    A bath tub can be filled by the cold water pipe in 9 minutes and by the hot water pipe in 11.25 minutes. A person left the bathroom after turning on both the pipes simultaneously and returned the moment when the bath tub was full. Finding that the waste pipe had been left open, he closed it. In 3.75 minutes more, the bath tub was full. In what time would the waste pipe empty it?

    Options :-

    1. 6.66 minutes
    2. 66.6 minutes
    3. 55.5 minutes
    4. 48 minutes
    5. None of these
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