The graph shows the relationship between the time and the speed of a train that has already left the station. Train Speed
Speed (miles per hour)
100
90
80
70
60
50+
40
30-
20+
10-
0
10 20 30 40 50 60 70 80 90 100
Time (minutes)

answer

a the answer hopes this

step-by-step explanation:

- "runner b is moving at a slower rate."

- "the graphs shown are graphs of distance(km) against time(min).

the slopes of this graphs are are given by:

slope = (change in y)/(change in x)

= (change in distance)/(change in time)

this is the formula for finding the speed. so, the slope of these graphs represent the speed of the runner.

taking each division in the graph to represent 1 on both axis:

runner a ⇒ speed = (2-0)/(1-0)

= 2/1

= 2 km/min

runner b ⇒ speed = (3-0)/(3-0)

= 3/3

= 1 km/min

this shows that   runner b is moving at a slower rate."