Answer:
The average speed for the entire run is 12 km/h.
Explanation:
The average speed is given by the following equation:
[tex] \overline{v} = \frac{d_{T}}{t_{T}} [/tex]
Where:
[tex]d_{T}[/tex]: is the total distance
[tex]t_{T}[/tex]: is the total time
If during the first hour, they ran a total of 13 kilometers and then, they ran 5.0 kilometers during the next half an hour we have:
[tex] d_{T} = 13 km + 5 km = 18 km [/tex]
[tex] t_{T} = 1 h + \frac{1}{2} h = 1.5 h [/tex]
Hence, the average speed is:
[tex] \overline{v} = \frac{d_{T}}{t_{T}} = \frac{18 km}{1.5 h} = 12 km/h [/tex]
Therefore, the average speed for the entire run is 12 km/h.
I hope it helps you!
