$10.$ Data obtained from aerial photograph shows five $(5)$ vehicles on a $1800$ ft$.$ long section of a

single highway lane. Traffic data collected at the same time indicated the average time

headway is $3$ sec$.$

Determine:

$($a$)$ The density on the highway, k

$($b$)$ The space mean speed, u

$($c$)$ The flow on the road, q