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Two workers, working separately but at the same speed, take 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 hours 20 minutes
B. 4 hours 40 minutes
C. 5 hours
D. 5 hours 20 minutes
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সঠিক উত্তরঃ D. 5 hours 20 minutes
Explanation: