22.
Milena and Mashuka can together complete a work in 36 days. However, Mashuka works alone and left the work after completing \( \frac{2}{5} \) part of work and then Milena starts work and completes the rest of the work. As a result both complete the work in 78 days. If Mashuka is more efficient than Milena then time (in days) taken by Milena to complete the work alone: