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     EduGorilla 
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    Three pipes A, B and C are attached to a tank. A and B can fill it in 20 and 30 minutes, respectively, while C can empty it in 15 minutes. If A, B and C are kept open successively for 1 minute each, how soon will the tank be filled?

    Options :-

    1. 167 minutes
    2. 160 minutes
    3. 157 minutes
    4. 155 minutes
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