in a certain factory a unit of work is completed by A in 5 minutes by B n 6 minutes by c in 8 minutes by d 9 minutes and in e is 12 minutes . find the average time to complete the unit of work
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Answer: ( 5 + 6+ 8 + 9 + 12 ) ÷ 5 = 40÷5 = 8
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