Work done by A in one hour: 2x
Work done by B in one hour: x
Number of days taken by A and B to do the work together: 12 hours
Work done by A and B together in one hour: \(\frac{1}{12}\)
\(\frac{1}{12}\) = 2x + x
\(\frac{1}{12}\) = 3x
X = \(\frac{1}{36}\)
Here X is Work done by B in one hour
∴ B alone will take 36 hours to complete the work.