What is the Velocity of A on the graph?
Distance is in km and time is in Seconds?

Answer:
15 km/s from the starting point
Explanation:
Velocity is total distace divided by total time.
From the picture, you can see that line consecutively traveled 30 kilometers- in 2 seconds.
(9 to 11 is two seconds, unless I'm wrong.)
So, total distance = 30 km. Total time = 2 seconds.
30/2 is 15.
the velocity of line A is 15 km/s from the starting point.
The line segment marked 'A' goes from the starting point to the distance of 30km in 2 seconds.
Speed = (distance) / (time)
Speed = (30 km) / (2 seconds)
Speed = 15 km/s
There's not enough given information to figure out the velocity.