The data shown below were obtained by time$-$lapse photography on a highway. Use regression analysis to fit these data t

the Greenshields model and determine the following.

$($a$)$ the mean free speed $($in $m\frac{i}{h})$

$m\frac{i}{h}$

$($b$)$ the jam density $($in veh$/$mi$)$

$ve\frac{h}{m}i$

$($c$)$ the capacity $($in veh$/$h$)$

veh$/$h

$($d$)$ the speed at maximum flow $($in $m\frac{i}{h})$

$m\frac{i}{h}$