Answer:
The motorist average speed for the trip is 88 km/h
Explanation:
In order to know her average speed, we have to refer to the following ecuation:
<V> (average speed) = [tex]\frac{Vfinal+Vinital}{2}[/tex]
So, according to that, we know that the motorist has been having a speed of 80km/h during 3 hours, and a speed of 100 km/h during 2 hours. It means that her speed during all the travel is 5 hours.
Then, we have to affect the 5 hours to the inicial and final speed as follows:
First, at 80 km/h, she travels during 2 hours so:
3h*80km/h= 240 km
And then, at 100 km/h:
2h*100km/h= 200 km
Which leads us to:
initial speed: 240 km/ 5 h= 48 km/h
and final speed of: 200 km/ 5 h= 40 km/h
Then, the average speed is:
<V> = 48 km/h + 40 km/h = 88 km/h
