A woman is going to a friend's house to discuss opening a business. At 11:00 (exactly) she starts from rest and accelerates at a constant 2.5 m/s2 for 9 s to get to her cruising speed. She then drives for 15 minutes at constant speed before she hits city traffic. She comes to a stop at her friend's house, which is 27 km away (straight-line distance), at 12:15 (exactly). Consider the interval from 11:00 to 12:15.
What is her average velocity?