Final answer:
Karoline's plane's average speed is calculated using the formula 'speed = distance ÷ time.' Given that the plane travels 168 km in 2 hours, its speed is 84 km/h.
Step-by-step explanation:
Karoline is on a plane that can fly 168 kilometers in 2 hours. To find the plane's speed, we use the formula for average speed, which is distance divided by time. In this case, the distance traveled is 168 km and the time taken is 2 hours. Thus, the speed of the plane is calculated as follows:
Speed = Distance ÷ Time = 168 km ÷ 2 hours = 84 km/h.
Therefore, the plane's average speed is 84 kilometers per hour (km/h).
In this case, the plane can fly 168 km in 2 hours. So its speed would be 168 km / 2 hours = 84 km/h.