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 =
Time to run each lap =
Speed is the amount of distance covered in a specified period of time.
Recall that the formula for calculating speed is:
Speed = 3miles / hour
As such, Elena can run 3 miles each hour.