Darryl was traveling at 65 mph on a road with a drag factor of 1.1. His brakes were working at 97% efficiency. What would you expect the average length of the skid marks to be if he needed to slam on his brakes? Darryl was traveling at 65 mph on a road with a drag factor of 1.1. His brakes were working at 97% efficiency. What would you expect the average length of the skid marks to be if he needed to slam on his brakes? 65 feet 31.35 feet 32.5 feet 134.77 feet