Question #$5-$ Density$/$headways

A section of roadway $($WBLs $1$ & $2)$ was observed to have an average speed of $80k\frac{m}{h}$ over a five kilometre segment. The roadway condition was observed to be "saturated" with no delays or unusual driver behaviour.

Compute the average space $(h_s)$ and time $(h_t)$ headway for this traffic and the density $(k)$ for $(a)$ WBL $1,($b$)$ WBL $2$ and $($c$)$ Both lanes.

I

If the average $h_s$ for the $2$ WB lanes is $50m.,$ compute the flow $($q$)$ for this segment of roadway.