To a police investigator, skid marks evidence is extremely important in determining how vehicles moved in a collision. Skid marks are the equivalent of fingerprints in a criminal investigation, and just as important. The speed a car was traveling can be calculated using the skid marks made as the car came to a stop. The formula for finding the speed of the vehicle is: Where: S = speed in miles per hour 30 = a constant value used in the equation D = length of the skid marks in feet f = drag factor for the road surface n = braking efficiency as a percent If a car’s speed is 70 miles per hour on a road surface with a drag factor of 0.50 and with a breaking efficiency of 85% (n = .85), what would be the length of the skid marks? Round to the nearest tenth. 450.6 482.4 463.2 384.3