I've asked this question a few times. This time i have tiny change in the question. Instead of people I'm using stopwatch & i have removed the accelerative frame. If you have any doubts I'll clear it but do not skip the topic. All i want is an answer that can be agreeable for all observers. Imagine one observer and two apparatus. Observer A who is coordinator and two boxes box 1 & box 2 which contain inactive stopwatches and automatic propulsion system which is motion dependent. Observer A sets the two boxes away from eachother equidistant from him. It forms an equilateral triangle. The distance between box 1 & 2 is 4 Lightyears. The coordinator first send some laser signals towards each box to confirm (to analyse in future) they were equal distance away. Then he sends another laser pulses to both of the boxes to activate their propulsion system and they starts to move towards each other. Both boxes accelerates and stop automatically when they reach a velocity .5c Then the coordinator sends another pulse to activate their stopwatches. So now we have two boxes moving towards eachother with same velocity. No acceleration included. Suppose if there were observers in each box, they thinks they are at rest and the other one is moving towards them at .99c. Therefore they thinks the others stopwatch has run slower. In this case whose watch will have run longer when they meet each other?