I would like to know whether my thought is right or wrong about time dilation example. Let's say, A person is standing at a starting point so his velocity is 0 ms'1. A car runs from that point in the velocity of 3 ms'1. A photon from a light source at that point is also emitted at the same time. Let the velocity of photon be 5ms'1.( Yeah I know the real velocity of photon) Relative velocity of the photon is 5ms'1 for both standing person and car. For the standing person at the starting point, the photon is at 50 meters ahead of that point after 10 seconds. For the car, the photon is at 50 meters ahead of it after 10 seconds. At that time, the car is at 30 meters ahead of the starting point and so the photon is at 80 meters from that point. That means, for the standing person, it takes 16 seconds to find the photon reach 80 meters away from the standing point. Yet, for the car, it takes just 10 seconds to find the photon reach 80 meters away from that point. When the person looks at the clock of the car, the clock motion of the car is running slower than his.