We will determine the wavelength through the relationship given by the distance between slits, this relationship is given under the function
Here,
m = Number of order bright fringe
= Wavelength
d = Distance between slits
Both distance are the same, then
Rearranging to find the second wavelength
Therefore the wavelength of the light coming from the second monochromatic light source is 550.3nm
Average speed of the driver is given as
if he moved for total time t = 3.5 hours
so the distance between the tow is given as
so the distance between St. Louis and Chicago is 224 miles