The graph represents the relationship between distance and time for an object that is moving along a straight line. What is the speed of the object
at t = 5.0 seconds? *

Ithink the answer would be 1,350!

Ithink the answer is c but then again i'm probably wrong

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. 

Answerit increases at a steady rate;