A car rental company is located three miles from the airport. A shuttle bus runs every two minutes on average doing a round trip between the airport and the rental company. The average round trip time is 20 minutes. So the average time for a customer to go from the airport to the rental company is 11 minutes (1 minute wait, plus ten minutes of travel). An executive argues that if the shuttle runs twice every minute (30 seconds apart on average), the average time (wait + travel) from the airport to the rental company would be one quarter of 11 minutes. In reality, what is the new average time (wait + travel)? Write your answer in minutes (use decimal numbers - for example, three minutes thirty seconds would be 3.5)