Answer:
the motorist's average speed is 55 km/h.
Step-by-step explanation:
To find the average speed, we need to calculate the total distance traveled and divide it by the total time taken.
In the first hour, the motorist travels at a speed of 45 km/h. So, the distance covered in the first hour is 45 km.
In the second hour, the motorist travels at a speed of 65 km/h. So, the distance covered in the second hour is 65 km.
Therefore, the total distance covered is 45 km + 65 km = 110 km.
The total time taken is 1 hour + 1 hour = 2 hours.
To find the average speed, we divide the total distance by the total time:
Average speed = total distance / total time
Average speed = 110 km / 2 hours
Average speed = 55 km/h