A can do a work in 3 hours. B and C together can do it in 4 hours, while A and C together can do it in 2 hours. How much time will B alone take to do it?
12 hours
Work per hour = 1 ÷ time taken.
A = 1/3, (A + C) = 1/2
C = 1/2 - 1/3 = 1/6
(B + C) = 1/4, so B = 1/4 - 1/6 = 3/12 - 2/12 = 1/12
Time taken by B alone = 12 hours
Hence, 12 hours.
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