The free flow speed of a highway is $100 \mathrm{~km} / \mathrm{h}$ and its capacity is $4000 \text{ vehicle}/ \mathrm{h}$. Assume speed density relation is linear.
For a traffic volume of $2000 \text{ vehicle} / \mathrm{h}$, choose all the possible speeds (in $\mathrm{km} / \mathrm{h}$ ) from the options given below (round off to two decimal places).
- $85.36$
- $65.20$
- $14.64$
- $7.22$
