A man is flying in a hot-air balloon in a straight line at constant rate of 5 feet per second, while keeping it at a
constant altitude. As he approaches the parking lot of a market, he notices that the angle of depressions from his
balloon to a friend's car in the parking lot is 35°. A minute and a half later, after flying directly over this friend's
car, he looks back to see his friend getting into the car and observes the angle of depression to be 36°. At that
time, what is the distance between him and his friend? (Round to the nearest foot.)
