In Java simulation

An airport has two concourses. Concourse I passengers arrive at a rate of one every 15 2 seconds. Concourse 2 passengers arrive at a rate of one every 10 5 seconds. It takes 30 5 seconds to walk down concourse I and 35 10 seconds to walk down concourse 2. Both concourses empty into the main lobby, adjacent to the baggage claim. It takes 10 3 seconds to reach the baggage claim area from the main lobby. Only 60% of the passengers go to the baggage claim area. Simulate the passage of 500 passengers through the airport system. How many of these passengers went through the baggage claim area? In this problem, the expected number through the baggage claim area can be computed by 0.60(500)=300. How close is the simulation estimate to the expected number? Why the difference if a difference exists?