To determine the time when the two cars will be 600 km apart, we need to calculate how long it will take for them to reach this distance given their speeds and directions.
Let's consider the scenario. The two cars are traveling in opposite directions, one going north at 70 km/h and the other going south at 50 km/h. Since they are moving away from each other, we can add their speeds to find the relative speed between the two cars: 70 km/h + 50 km/h = 120 km/h.
To calculate the time required to cover a distance of 600 km at a speed of 120 km/h, we can use the formula:
Time = Distance / Speed
Time = 600 km / 120 km/h
Time = 5 hours
Therefore, it will take 5 hours for the two cars to be 600 km apart. Since they parted at 9:00 AM, we can add the 5 hours to find the time when they will be 600 km apart:
9:00 AM + 5 hours = 2:00 PM
So, they will be 600 km apart at 2:00 PM.