Average speed of the driver is given as
[tex] v = 64 mph[/tex]
if he moved for total time t = 3.5 hours
so the distance between the tow is given as
[tex]d = v* t[/tex]
[tex]d = 64 * 3.5[/tex]
[tex]d = 224 miles[/tex]
so the distance between St. Louis and Chicago is 224 miles
