Frankie is getting his turtle ready for a big race. He decides to graph the turtle's progress. The distance the turtle travels is put on the y axis in feet. The time it takes for the turtle to travel is graphed on the x axis in minutes. What is the value of the turtle's speed (its distance traveled per minute)?
 A) 2 ft/minute 
 B) 3 ft/minute 
 C) 5 ft/minute 
 D) 
 1
 3
 ft/minute