$0$ is the smallest rational number.

Find the rational number (in $\frac{p}{q}$ form) for the question mark marked on the number line.

Find the rational number for the question mark marked on the number line.

Find the rational number for the question mark marked on the number line.

The points $S, Y, N, C, R, A, T, I$ and $O$on the number line are such that $CN=NY=YS$ and $RA=AT=TI=IO.$ Find the rational numbers represented by the letters $Y, N, A, T$ and $I.$