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     EduGorilla 
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    To completely fill a half filled tank, tap X is opened and the tank will be fully filled in 20 hours. But after 4 hours, the power goes off. Before the power comes back, exactly half of the water in the tank has been used up. How much time would it take now to fill the tank completely? 

    Options :-

    1. 8 hours
    2. 10 hours
    3. 28 hours
    4. 16 hours
    5. 15 hours
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