To find the average speed, we need to divide the total distance traveled by the time taken. In this case, the distance is 120 kilometers and the time taken is 45 minutes.
First, we need to convert the time from minutes to hours since average speed is typically measured in kilometers per hour.
45 minutes is equal to 45/60 = 0.75 hours.
Now we can calculate the average speed:
Average speed = Distance / Time
Average speed = 120 km / 0.75 h
Average speed = 160 km/h
Therefore, the driver's average speed was 160 km/h.