Time and Interval Problems

A small parking garage records two times for every car: when it passes the entry gate and when it passes the exit gate. One day of these records answers two questions that sound alike. The first asks how many minutes cars spent parked, which customers pay for. The second asks for how many minutes at least one car was inside. The lower level's ventilation fans run whenever a car is parked there, so this is how long they ran.

On the seven stays below, the first answer is 418 minutes and the second is 333