A can complete a work in 12 days, while B can complete it in 15 days. How many days will they take to finish the work together?
Work done by A in one day = 1/12. Work done by B in one day = 1/15. Combined work in one day = (1/12 + 1/15) = (5 + 4) / 60 = 9/60 = 3/20. Time taken to finish the work together = 20/3 days = 6.67 days. Correct option: a) 6.67 days
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