Police use the formula $\displaystyle {V}{\left({L}\right)}=\sqrt{{{20}{L}}}$ to estimate the speed of a car in miles per hour, based on the length, $\displaystyle {L}$, in feet, of its skid marks when suddenly braking on a dry, asphalt road.

At the scene of an accident, a police officer measures a car's skid marks to be 134 feet long. Approximately how fast was the car traveling?


Round your answer to one decimal place as needed

One of the people involved in the accident says that he was traveling 49 mph when he braked. How long in feet should his car's skid marks be?


Round your answer to one decimal place as needed