Rates Question1

Car A is traveling north at 90 km/h and is positioned 12 km north of an intersection. Car B is traveling west at 72 km/h and is positioned 6 km west of the intersection. The rate at which the distance between the cars is increasing is equal to the time in minutes for a bicycle to travel a distance given its rate of travel as s(t) = t and starting at s(0) = 4 km.