According to our current understanding of physics, as described by Einstein's theory of relativity, it is not possible to travel faster than the speed of light. The theory of relativity states that as an object with mass accelerates towards the speed of light, its relativistic mass increases, requiring an infinite amount of energy to reach or exceed the speed of light. Therefore, the idea of traveling at 3 times the speed of light is not compatible with our current scientific understanding.
However, if we consider the hypothetical scenario where faster-than-light travel were possible, it would introduce significant challenges and paradoxes related to time. According to the theory of relativity, as an object approaches the speed of light, time dilation occurs. This means that time would pass more slowly for the moving object relative to a stationary observer. If one were to travel faster than light, the effects of time dilation become even more pronounced.
If we assume that going faster than the speed of light equates to time travel, it is commonly speculated that it could allow for the possibility of traveling backward in time. This is based on the idea that exceeding the speed of light could potentially disrupt the cause-and-effect relationship of events, leading to paradoxes and violations of causality as we currently understand it.
It's important to note that these are purely hypothetical scenarios and the concept of traveling faster than light and its implications on time are purely speculative at this point. Our current scientific understanding suggests that the speed of light is an upper limit and that time travel, especially backward time travel, remains speculative and outside the realm of known physical laws.