Final answer:
The car's average speed is 70 km/h, and by multiplying this by 5 hours, we determine that the car can travel 350 km in 5 hours, which aligns logically with the initial data provided.
Step-by-step explanation:
If a car is able to travel 210km in 3 hours, to find out how far it can travel in 5 hours, first we need to calculate its average speed. The average speed, Vavg, is the distance traveled divided by the time taken. So for this car, the average speed would be 210km divided by 3 hours, which equals 70 km/h.
Once we know the average speed, we can calculate the distance that can be traveled in 5 hours by multiplying the speed by the time. So, the car would travel 70 km/h times 5 hours, equaling 350 km. Therefore, the car can travel 350 km in 5 hours.
It's always a good practice to check whether the answer is reasonable. For this case, if the car can travel 210km in 3 hours, it should be able to travel more in 5 hours, so 350 km indeed seems reasonable.