The formula, 1) = x/20L is used to estimate the speed of a car, 1), in miles per hour, based on the length, L, in feet, of its skid marks when suddenly braking on a dry, asphalt road. a. At the scene of an accident, a police officer measures a car's skid marks to be 216 feet long. Approximately how fast was the car traveling? Round your answer to 2 decimal places. '0 = C] miles per hour If the posted speed limit is 60 mph, was the car speeding? 0 Yes O No b. A car going at 40 miles per hour is involved in an accident. If the skid marks are measured, how long will they be? (Round answer to 2 decimal places and include the units in your answer.)