Be careful when plagerizing from unknown sources on the internet!
To cover 109 yards from a stop in 6 seconds while only reaching 25 mph top speed is impossible. Besides, it conflicts with the previous sentence from your source.
(36.667X6)/3=73yds at a constant speed of 25mph in 6 seconds
Actually the bear would have probably been on him in 4 seconds. He’d been slipping in the brown stuff at his feet for at least two.