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If it takes 10 people 5 days to complete a piece of work, working 2 hours a day, how long will it take 2 people to do the same work, working 5 hours a day?

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Interesting fact:

Among the many tasks that aspiring astronauts have to master is the “spacewalk.” To prepare for this they attend Johnson Space Center’s 60-foot-deep swimming pool where they can wear the suits in a simulated environment to that of space.