To solve this problem we will apply the concepts related to the double slit-experiment. For which we will relate the distance between the Slits and the Diffraction Angle with the order of the bright fringe and the wavelength, this is mathematically given as,

Here,
d = Distance between Slits
m = Order of the fringes
= Wavelength
= 

Rearranging to find the angle,




Therefore the angle that the fourth order bright fringe occur for this specific wavelenth of light occur is 32.19°
Explanation:
3
i believe that they are all going at 3.2 meters each, I did 4 times 0.8
Answer:
The speed of light measured in any frame is c = 3.00E8 m/s.
This is one of Einstein's postulates of special relativity.