A motorist travels for 2 hours at an average speed of 45 km/h. What is her average speed for the whole journey?

To find the average speed for the whole journey, we need to first calculate the total distance traveled.

Distance = Speed x Time
Distance = 45 km/h x 2 hours
Distance = 90 km

Now, to find the average speed for the whole journey, we divide the total distance by the total time taken.

Total time taken = 2 hours
Total distance = 90 km

Average speed = Total distance / Total time taken
Average speed = 90 km / 2 hours
Average speed = 45 km/h

Therefore, the average speed for the whole journey is 45 km/h.

45 km/h