The two protons have the same charged and mass and are in the same magnetic field. They do have different velocities however, so the proton with the higher speed will move in a circular path with a greater radius.
The time to complete one revolution (T) can be found from the velocity (v) and the circumference `(2pir)`
`v = (2pi r)/(T), T = (2pi r)/(v)`
Substituting for the radius, we find that
`T = (2pi r)/(v) = (2pi mv)/(v|q|B) (2pi m)/(|q|B)`
This expression shows us that the time required to complete one revolution (the period) is independent of the velocity. Both protons complete one revolution in the same amount of time