7 Una piscina tiene 210 m2 de área y está formada por un rectángulo para los
adultos y un trapecio para los niños. Observa el dibujo y calcula:
a) El área de cada zona de la piscina.
30 m
b) La longitud de la piscina de adultos.
4 m
5 m
Ya

- "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."

could you provide figure.