Consider the following time$-$space diagram:

Note: the highest $y-$value should be $1000,$ not $100$

a$)$ determine the flow at Section A$-$A

b$)$ What is the average headway at A$-$A$?$

c$)$ determine the flow at Section $B-B$

d$)$ What is the average headway at $B-B?$

e$)$ What is the average speed of Vehicle $1?$

f$)$ What is the average speed of Vehicle $9?$