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An outlet pipe can empty a cistern in 3 h. In what time will the pipe empty two-third part of the cistern?

4 h
2 h
3 h
5 h

Correct Answer: 2 h

Explanation:

Time taken by the pipe to empty the cistern = 3 h
Then, time taken by the pipe to empty the 2/3 part = 3 x 2/3 = 2 h

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