To calculate the time it takes to travel a certain distance at a given average speed, you can use the formula:
Time = Distance / Speed
In this case, the distance is 400 km and the average speed is 120 km/h.
Plugging in the values:
Time = 400 km / 120 km/h
Calculating this expression:
Time = 3.33 hours
Therefore, it will take approximately 3.33 hours to travel 400 km at an average speed of 120 km/h.