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     EduGorilla 
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    Two pipes A and B can fill a cistern in 371/2 min and 45 min, respectively. If both the pipes are opened, then when should the second pipe be closed so that the cistern may be filled in half an hour?

    Options :-

    1. After 7 min
    2. After 9 min
    3. After 12 min
    4. After 5 min
    5. After 10 min
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