How would you solve this.......... Calculate the carrying capacity (number of cars passing a given point per hour) on a freeway with three lanes (in one direction) using the following assumptions: the average speed is 90 km/h. the average length of a car is 6.0m, and the average distance between cars should be 65m. ANS: 3800/hr. I'm really stuck at this question. Somebody please help, we are currently studying velocity and acceleration in Physics.