Mugdha and Mayuri, working together can complete a job at 18 days. However, Mayuri works alone and leaves after completing two fifths of the job and then Mugdha takes over in 39 days. How many days would Mugdha alone have taken to do the job if Mayuri worked faster than Mugdha?

Options

A. 72
B. 30
C. 25
D. 45