Answer:
A.
Elena can run 3 miles per hour.
Step-by-step explanation:
Given that:
a circular running track = 1/5 mile
On this track, Elena runs completing each of the laps in 1/15 of an hour
We are to find Elena running speed.
It implies that the distance of Elena = [tex]\dfrac{1}{5}[/tex]
Time to run each lap = [tex]\dfrac{1}{15} \ of \ an \ hour[/tex]
Speed is the amount of distance covered in a specified period of time.
Recall that the formula for calculating speed is:
[tex]Speed = \dfrac{distance}{time}[/tex]
[tex]Speed = \dfrac{\dfrac{1}{5}}{\dfrac{1}{15}}[/tex]
[tex]Speed ={\dfrac{1}{5}\times \dfrac{15}{1}[/tex]
Speed = 3miles / hour
As such, Elena can run 3 miles each hour.
