Four examiners can examine a certain number of answer papers in 10 days by working for 5 hours a day. For how many hours in a day would-2 examiners have to work in order to examine twice the number of answer papers in 20 days ?

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Four examiners can examine a certain number of answer papers in 10 days by working for 5 hours a day. For how many hours in a day would-2 examiners have to work in order to examine twice the number of answer papers in 20 days ?