the answers are correct; but sometimes writers who say 'cross-cuts' just mean 'cuts' - that is, each shot was half a second long, but they weren't necessarily jumping between two parallel scenes, just different angles on the same scene (common with chases, explosions etc). Sounds a bit hard on the eyes, but Hollywood thinking these days is that audiences are much quicker in keeping up with things than their grandparents, and require much more such action to keep them interested, whereas their grannies would happily have watched a three-minute scene in Gone with the Wind that didn't have any cuts at all.