Question: A cistern is provided with two pipes A and B. A can fill a cistern in 20 minutes and B can empty it in

A cistern is provided with two pipes A and B. A can

A cistern is provided with two pipes A and B. A can fill a cistern in 20 minutes and B can empty it in 24 minutes. If A and B pipes are opened on alternate minutes starting with pipe A, find in how many hours, the cistern shall be full? 1. 4 hours 49 min. 2. hours 49 min. 3. 3 hours 18 min. 4. None of these 5. Can't be determined

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