The first thing I would Like to do in this thread is clarify the question that needs the provision of an answer. It, I believe is a common question about SRT especially regards time dilations and RF that seem to end up with more than one tick rate. Standard SRT puzzle: Clock A see's clock B fly away at velocity and return showing an accumulated elapsed time of 8 units. A's clock shows 10 units. A = 10 B= 8 Simultaneously Clock B see's clock A fly away at velocity and return showing an accumulated time of 8 units. B's clock shows 10 units. B= 10 A= 8 Regardless of who did the flying when we compare clocks as a single RF [relative v=0] we have Clock A = 10 and 8 units of accumulated time. Clock B = 8 and 10 units of accumulated time. 1] How is this question best described in the proper lingo? 2] What is the best way of solving this question? To answer by saying that the question is invalid is not a valid answer.... Please Register or Log in to view the hidden image! N.B. I am not arguing issues of SRT validity. I simply wish to know how SRT would answer the question. So that in future when this question comes up again [and I am sure it will] there is a straight forward answer to provide.