A alone can do a piece of work in 12 days and B alone can do it in 15 days, find the time taken (in days) when both A and B work together. *
ans in decimal
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6.6 days or 6 days 16 hours
From the question,
A can do 1/12 work in one day
B can do 1/15 work in one day
A and B together can do 9/60 of the work in one day.
From this we can get to know that both require 60/9 days to do it which is nothing but 6.6 days or 6 days 16 hours
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