Question

Which colour of light travel faster in vacuum

Answer 1

All colored light travels with same speed in vacuum.Bt travels with different speed in a medium. 
hope it helped u.

Answer 2

Answer:

The speed of light in vacuum is constant and does not depend on characteristics of the wave (e.g. its frequency, polarization, etc). In other words, in vacuum blue and red colored light travel at the same speed c.

Explanation: