It IS unclear. They had to play 20 questions before you clarified the problem enough for somebody to give the 2nd answer, which is the only correct answer. The question as asked in the OP is insufficiently specified to have a correct answer, hence the other answers you might have received. Once the problem had been sufficiently clarified, it turns out that SR is not involved at all in the computing of the answer. It would be involved only if the race was judged in a different frame.