Question regarding a simulation using randrange

I'm very new to Python and am a bit lost on a project I was assigned.

Here's a description of what I have to do:

Write a Python function to run a Parking Lot (PL) simulation, called PLSimulation, which takes four integers as parameters. The first parameter is the minimum number of cars that can park in the PL during one hour; the second parameter is the maximum that can park during one hour. The third parameter is the maximum number of cars that may leave the PL during one hour. The fourth parameter is the number of hours to run the simulation. Your function should simulate parking and leaving cars for the specified number of hours. In each hour, the following occurs in this order:

1. A random number of cars arrive, ready to park (between the minimum and maximum). That number is added to a count of the number waiting to park.

2. The maximum number of cars that may leave, allowing the same number of cars to park, so that number is subtracted from the count of the number waiting to park (if there are that many waiting to park).

Initially, the number of cars waiting to park is 0. To generate a random number of cars each hour, use the randrange function, which takes two integer parameters, and which must be imported from the random module. Find the car arrival rate (between the minimum and maximum), the car departure rate, and the number of cars waiting to park after the simulation has run for the specified number of hours.

Here's what I have so far:

I know that:

    minArriving: minimum number of cars that arrives each hour

    maxArriving: maximum number of cars that arrives each hour

    maxLeaving: maximum number of cars that departs each hour

    hours: hours to run the simulation

So I put in

    minArriving = "10"

    maxArriving = "50"

    maxLeaving = "50"

    hours = "5"

To start my function, so far I have:

    def runSimulation(minArriving, maxArriving, maxLeaving, hours):

         from random import randrange

         return (minArriving, maxArriving, maxLeaving, hours)

    queue = 0

So far, this is all I have. I'm not sure if I'm on the right track or not so I'd really appreciate some guidance.

Thanks!