Question: Three pipes A, B and C are connected to a tank. A and B can fill it in 60 and 75 minutes respectively, while

Three pipes A, B and C are connected to a tank. A

Three pipes A, B and C are connected to a tank. A and B can fill it in 60 and 75 minutes respectively, while C can empty it in 100 minutes. If A, B and C are kept open successively for 1 minute each, how soon will the tank be filled? 1. 176 min 2. 150 min 3. 180 min 4. 170 min 5. None of these

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