1.000: Customer 0 arrives
1.000: Customer 0 service begin (by Counter 0)
2.100: Customer 1 arrives
2.100: Customer 1 service begin (by Counter 1)
3.100: Customer 1 service done (by Counter 1)
3.100: Customer 1 departed
4.200: Customer 2 arrives
4.200: Customer 2 service begin (by Counter 1)
5.000: Customer 0 service done (by Counter 0)
5.000: Customer 0 departed
5.200: Customer 2 service done (by Counter 1)
5.200: Customer 2 departed