8. A student walks the 80.0 m length of the main hallway in 60 s. They walk 0.8 m/s for the first half of the distance. Find their velocity for the second half.

You need to be more specific.  i really don't know what a "motion map" is.you can draw a graph of an object's position, distance, displacement, speed,velocity, or acceleration versus time, or you can draw a graph of the object's x-position versus its y-position and not give any information about time at all.if the graph presents position or displacement against time,  then constant velocity is a straight line . . i.e. a line that has  constant slope.if the graph shows speed against time, then constant velocityis a horizontal piece of line.if the graph shows acceleration against time, then constant  velocity is a piece of line that lies on the x-axis . . it's value is zero. 

Answerfrom left to right, (largest to smallest); buffy,aiko,chandra,freja, and evita

Ineed the situations,in the question