Tricky Math Problem?

Question

At the scene of a traffic accident, a police investigator must determine the speed of both vehicles. The investigator uses the formula where s represents speed, measured in miles per hour, and l represents the length of the skid marks, measured in feet. Approximately how long are the skid marks of the car that is going 65 miles per hour?

Answer 1

This is very tricky--you didn't put in the equation.

Answer 2

I do believe you have left something out of the problem, like the relationship between s and l.