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A cistern is provided with two pipes A and B. A can fill it in 20 minutes and B can empty it in 30 minutes. If A and B...

Solution

The level pipe A can fill in 1 minute is = 1/20 The level pipe B can empty in 1 minute is = 1/30 Let, one round be equal to 1 minute of pipe A open and then 1 minute of pipe B open (total of 2 minutes). The level of cistern filled in 1 round is = (1/20) − (1/30) = 1/60 Let, the total required rounds be =...

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