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Question

In an office, an employee plans to do a work in 12 days with 4 laptops. But after 4 days, he found that only 40% of the work is done with the laptops working for 4 hours a day. If he want to complete the work in the planned time with the laptops, how many hours per day the laptops have to work?

A 6 hours

B 4 hours

C 5 hours

D 3 hours

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