Answer:
Liam's rate = 3 meters per second
Edgar's rate = 3.2 meters per second
Edgar swims faster
Step-by-step explanation:
Liam:
The equation [tex]d=3t[/tex] gives the distance, d, in meters that Liam swims with respect to time, t, in seconds.
When [tex]t=0,\ d=0.[/tex]
When [tex]t=1,\ d=3.[/tex]
Rate of change:
[tex]\dfrac{3-0}{1-0}=3[/tex]
Liam's rate is 3 metres per second.
Edgar:
When [tex]t=20, \ d=64.[/tex]
When [tex]t=40,\ t=128.[/tex]
Rate of change:
[tex]\dfrac{128-64}{40-20}=\dfrac{64}{20}=3.2[/tex]
Edgar's rate is 3.2 metres per second.
Edgar swims faster.
