Working efficiency of A is 20% more than that of B. B can complete a work 'X' in 36 days. B and C together started working on the work 'X' and after 10 days they both left the work and then remaining work is done by A alone in 15 days. After that, A, B and C working together completed `(1)/(3)`rd of work 'X', and then A and C are replaced by D. Now remaining of work 'X' is completed by B and D together in 12 days. In how many days D alone can complete the work?

Options

A. A)36 days
B. B)30 days
C. C)45 days
D. D)40 days

Answer

A