Speed, distance & stopping distance

Near Daarle you are driving 130 km/h on a road without a speed limit. What is your reaction distance per the book's rule of thumb?

Explanation

False — trap: confusing it with quadratic growth. 84.50 m is the braking distance (quadratic formula); the reaction distance uses a different, linear rule of thumb: ((130:2)+10%):2 = 35.75 m (Book p.125-126).