\begin{aligned}
u &=36 km / hr =\frac{36 \times 1000}{3600}=10 m / s \\
v &=360 km / hr =\frac{360000}{3600}=100 m / s \\
s=?, a=\frac{v-u}{t} \\
s &=u t+1 / 2 a t^{2} \\
a &=\frac{v-u}{t}=\frac{100-10}{20} \\
&=\frac{90}{20}=4.5 m / s ^{2} \\
s &=10 \times 20+1 / 2 \times 4.5 \times 202 \\
&=200+4.5 \times 200 \\
&=1100 m =1.1 km .
\end{aligned}