According to our current understanding of time travel based on the theory of relativity, it is generally believed that backward time travel, also known as time travel to the past, is highly unlikely or even impossible. While there are hypothetical solutions to Einstein's equations, such as wormholes or spacetime geometries known as closed timelike curves, they are currently speculative and have not been observed or proven to exist.
However, for the sake of exploring your question, let's consider a scenario where two individuals could travel back in time simultaneously, with one moving forward and the other moving backward in time. In such a case, it is important to note that time would be like a single dimension in which they are moving in opposite directions.
If we assume that time travel to the past is somehow possible, the individuals would be moving along different trajectories within the timeline. As a result, they would experience events and moments in reverse order relative to each other. They would effectively be living in opposite temporal directions.
Given this situation, it is unlikely that they could meet or directly interact with each other, as their movements through time would be entirely separate. They would experience history unfolding in opposite directions and, as a result, their paths would not intersect at any point.
Furthermore, even if they were somehow aware of each other's existence, the differences in their temporal experiences would likely make communication or coordination extremely challenging. They would not be able to exchange information in real-time or synchronize their actions effectively.
It's important to reiterate that the concept of backward time travel remains speculative and theoretical. While it makes for interesting thought experiments, the actual feasibility and consequences of such travel are still subjects of scientific exploration and debate.