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A cistern has three pipes, A, B and C. The pipes A and B can fill it in 4 and 5 hours respectively and C can empty it in 2 hours. If the pipes are opened in order at 1, 2 and 3 A.M. When will the cistern be empty?

A. 3 PM
B. 7 PM
C. 4 PM
D. 5 PMCorrect Answer
Correct Option: D. 5 PM

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