Discussion
If it takes two workers, working separately but at the same speed, 2 hours and 40 minutes to complete a particular task, about how long will it take one worker, working at the same speed, to complete the same task alone?
Answer: D
One worker alone takes 5 hrs. 20 min.
Two workers at the same speed, working on the task together, finish it in 2 hours 40 minutes, which is 160 minutes. One worker does half the work per minute, so takes twice as long: \(2 \times 160 = 320\) minutes, which is 5 hours 20 minutes.
1 hr. 20 min halves the time instead of doubling it. 4 hrs. 40 min and 5 hrs. come from adding instead of doubling, or from rounding.
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