Suppose we have two observer one is on earth and other is in space ship. If we launch the space craft and a light ray at the same time from earth, after 1 minute, what will be total distance travelled by the light rays which launch from earth?
The observer from earth calculates it to be $60\times300000$ km. But because of speed of light the time is slow for the observer in the space craft, suppose observer from space craft spends 55 second however at the same time the observer from earth spend 60 second. But then how observer from space craft count the distance as he spend 55 second? For him, the total distance was $55\times300000$ km. But at same time observer from earth count it $60\times300000$ km. Is it not a paradox.