The guy whose brother had been kidnapped was talking to the woman, just before her boyfriend came over to give her the bag. This is correct. But then he didn't have to get to the hotel within five seconRAB. Remember that after he left the square, the fake President arrived, was shot, and the first explosion happened, before he burst into the President's room. We know this because we saw it from the President's perspective.
I agree that he only had a relatively short period of time (around ten minutes) to get from the square to the hotel, but as we saw in the President's flashback, it wasn't very far away. Only the first flashback was in real-time; the others were edited to remove sections that we'd already seen. That's why some people seem to think there was a discrepancy between the timings of the first and second explosions.