Question

In an office, an employee plans to do a work in 16days with 3 laptops. But after 9 days, he found that only 30% 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 12 hours
B 8 hours
C 9 hours
D 15 hours
E 10 hours
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