I know, again you are confused to see my mathematics. But I am right as usual. Let’s explain...

As we all know that the speed of light (denoted by c) is exactly 299,792,458 meters per second. So it’s equal to 299792.458 kilometers per second. By round off, we use 300000km per second.

Let’s imagine a car which is crossing 300000km per second. As usual, this car also has headlights. Turn on headlights of the car. Now you question is - The car is crossing the distance of 300000km per second and the light from car headlights is crossing the distance of 300000km per second. How much distance does the car and the light from car headlights travel in a second?

Probably you will say – they both will cross the distance of 600000km (300000km + 300000km) per second. Yes, your mathematics is right. But according to my scenario, you are wrong. It will not happen actually. Because speed of the car is equal to the speed of light. So the car and the light from the car headlights will cross same distance of 300000km per second in parallel. So it's like 300000km + 300000km = 300000km.

As we all know that the speed of light (denoted by c) is exactly 299,792,458 meters per second. So it’s equal to 299792.458 kilometers per second. By round off, we use 300000km per second.

Let’s imagine a car which is crossing 300000km per second. As usual, this car also has headlights. Turn on headlights of the car. Now you question is - The car is crossing the distance of 300000km per second and the light from car headlights is crossing the distance of 300000km per second. How much distance does the car and the light from car headlights travel in a second?

Probably you will say – they both will cross the distance of 600000km (300000km + 300000km) per second. Yes, your mathematics is right. But according to my scenario, you are wrong. It will not happen actually. Because speed of the car is equal to the speed of light. So the car and the light from the car headlights will cross same distance of 300000km per second in parallel. So it's like 300000km + 300000km = 300000km.