To calculate the time it will take for a car to travel a certain distance at a given speed, you can use the formula:
Time = Distance / Speed
In this case, the distance is 280 km and the speed is 70 km/h. Plugging these values into the formula:
Time = 280 km / 70 km/h
Simplifying the equation:
Time = 4 hours
Therefore, it will take the car approximately 4 hours to travel 280 km at a speed of 70 km/h.