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4. Suppose in a certain office, a one page document is typed by secretary A in 4 minutes. The same document is typed by secretaries

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4. Suppose in a certain office, a one page document is typed by secretary A in 4 minutes. The same document is typed by secretaries B, C and D in 5, 6, and 10 minutes, respectively. What is the average time taken in typing the document by the four secretaries? How many such documents do you expect to be typed in one day comprising of 8 working hours? (Use geometric mean formula)

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