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two workers, working sepparately but at the same speed,take 2 hours 40 minutes to complete a particular task.How long will one of these two workers take to complete the same task alone?

A. 1 hour 20 minutes
B. 4 hours 40 minute
C. 5 hours
D. 5 hours 20 minute
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সঠিক উত্তরঃ D. 5 hours 20 minute
Explanation: