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P and Q together can complete a job in 90days, Q and R takes 60 days to complete the same work and P and R will take 45 days to complete the same work. How much time will P, Q and R will take to complete the work together.
40 days
42 days
36 days
44 days
( 1/90 + 1/60 + 1/45)*1/2 = (1/P +1/Q + 1/R) = 1/40 so 40 days
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