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Answer : 4 3 pm Explanation : Answer: D) 3 pm Explanation: Work done by P and Q in the first two hours, working alternately= First hour P Second hour Q⇒14 112=13work is completed in 2 hoursThen, the total time required to complete the work by P and Q working alternately=2 x 3= 6hoursThus, work will be completed at 3pm.

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