yes.the ratio is for eg 4/5 n they r asking min distance n1=4k;n2=5k..(for some k),dist will be min when n is min so k=1 and n1=4 nand n2=5

Yes, the ratio is for example $4/5$ and they are asking for minimum distance $n_1=4k$; $n_2=5k$ (for some $k$), the distance will be minimum when $n$ is minimum, so $k=1$ and $n_1=4$ and $n_2=5$.