Final answer:
In Newtonian mechanics, if two observers see different times, then they must also see different distances for the speed to be the same.
Step-by-step explanation:
In Newtonian mechanics, all observers agree on the relative speed between two objects. If two observers see different times, then they must also see different distances. This is because speed = distance/time, and if the time is different for each observer, the distance must also be different for the speed to be the same for both observers.