Originally Posted by VRPdommy

While true, and also not ? Let's just talk geometry.

Draw a oscillating line of short wavelength over a distance.
Then
Draw a oscillating line of the 'same intensity' with a higher frequency over the same distance.

Measure the total length of your lines. They are not the same.
Now imagine in geometry that this is a 3d depiction (as it is in the real world) and that the distance is circular as it is and that distance can be multiplied by pi.
How you use this information is dependent on what you are calculating.

If they make the same endpoint at the same time, one will have traveled farther than the other across the 'same span' of distance and time.
Obviously, one is traveling faster than the other if the lines total distance in oscillation are not the same.

The point is, just because one is traveling slower than the other does not mean it can't achieve the same distance span in the same time.

It is only relevant for what you are measuring.