Janardan completes $$\frac{2}{3}$$ of his work in 10 days. Time he will take to complete of the same $$\frac{3}{5}$$ work, is ?

Janardan completes $$\frac{2}{3}$$ of work in 10 days
Janardan completes 1 of work in
$$\eqalign{ & = \frac{{10 \times 3}}{2} \cr & = 15{\text{ days}} \cr} $$
Janardan completes $$\frac{3}{5}$$ of work in
$$\eqalign{ & = 15 \times \frac{3}{5} \cr & = 9{\text{ days}} \cr} $$