Answer:
[tex]\displaystyle V=7.5\ km/h[/tex]
Explanation:
Average Speed
If an object travels a distance d in a time t regardless of the direction, the average speed is the quotient of the distance over the time:
[tex]\displaystyle V=\frac{d}{t}[/tex]
It's known a person runs d=15 kilometers in t=2 hours, thus his/her average speed is:
[tex]\displaystyle V=\frac{15\ km}{2\ h}[/tex]
Calculating:
[tex]\boxed{\displaystyle V=7.5\ km/h}[/tex]
