Question 958809
Assume that the steps you take can be used to measure time.
They can be because you're taking the same step size at a constant speed. 
It took the car 18 steps to reach the corner from the time the car passed you.
It took you 18+126 steps to reach the corner from the time the car passed you.
You're walking at 4 mph. 
Rate x Time = Distance
{{{4*(18+126)=S*18}}}
{{{S=(4/18)(144)}}}
{{{S=32}}}{{{mph}}}