A hot air balloon is rising vertically above a level, straight road at a constant rate of 1 feet per second. A the moment when the balloon is 65 feet above the road, a bicycle moving at a constant rate of 17 feet per second passes directly under it. Determine the rate of change of the distance betweeen the hot air baloon and the bycicle 3 seconds later. Hot Air Balloon feet per second Question Help: Vidon Bike