Accident investigation: After an accident, police officers will try to determine the appro...

Accident investigation: After an accident, police officers will try to determine the approximate velocity V that a car was traveling using the formula V = , where L is the length of the skid marks in feet and V is the velocity in miles per hour. (a) If the skid marks were 54 ft long, how fast was the car traveling? (b) Approximate the speed of the car if the skid marks were 90 ft long.