To calculate the speed of the car, we can use the formula:
Speed = Distance ÷ Time
Here, the distance traveled by the car is 450 kilometers and the time taken is 6 hours. Substituting these values in the formula we get:
Speed = 450 km ÷ 6 hours
Simplifying this expression gives:
Speed = 75 km/hour
Therefore, the car traveled at a speed of 75 kilometers per hour.