Q. 1. Newark Liberty airport has two runways. Runway 1R serves only large jets, while runway 1L serves only smaller jets. Large jets wishing to use runway 1R arrive at average rate of 20 per hour, while smaller jets using runway 1L arrive at average rate of 30 per hour. Each runway can handle an average of 60 jets per hour. Unfortunately, it is rather expensive to keep aircraft airborne while waiting to land. Large jets incur a cost of $25 per minute, while small jets cost $10/minute while circling to land. Calculate total hourly waiting cost for all jets at airport.

2. With regard to question 1, because of repair work, assume Runway 1L must be temporarily shut down. During this time, all jets will land on runway 1R. Calculate total hourly waiting cost for all jets at airport with only this one runway available.