Albertino and Mara are driving their remote control cars in a large field. Albertino’s car starts \(10\) km north of Mara’s car. At the same time, Albertino starts driving his car south and Mara start’s driving her car east. Both cars travel at a constant speed of \(40\) km/hr.
After how many minutes of driving will the total distance travelled by the cars be equal to the distance between the cars?