Calm down a little, everybody.
OP, you said it yourself: tomorrow's the conference meet. Not just the athletes get a little on edge as the big meets approach; so do the coaches. They want so much for you to be successful and have a great meet, and they want you to feel, as you go into the meet, like you did everything possible to get ready. They want you to feel like you'll run great because you've earned it.
I heard a good quote from Mark Wetmore some years back, to the effect of "Don't listen to anything I tell you in the last 48 hours before the meet." Smart idea: coaches can respond to the tension of the situation with inappropriate (dumb) comments.
As for the screaming at your #1: I'd be willing to bet there's been some history between him and the coach(es); that he knew he was flouting their authority; and that he did it anyway (maybe as *his* response to the tension).
Anyway, it looks like you guys are all probably feisty and ready for a good meet. After the meet's over--maybe a couple days after--you can *privately* go to the coach(es) and say why this incident bothered you. Between now and then, however, you can ask yourself why it seemed important--knowing your coach(es) as you do--to cut a measly ten minutes out of today's run.
By the way, I liked this advice from gamecock: "If you have a reason to not want to do the extra 10, bring it up before the workout."
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This reminds me of a true story: I know of an excellent (former) small-college coach whose teams were consistently competitive at a national level. One year, in the last practice before they were going to leave for Nationals, he assigned an easy run around a particular loop. He noticed that some of the guys finished 10-15 minutes behind the others, and got upset--there was a fair amount of intrasquad competition, and some guys liked to outwork their teammates, but they all knew how he felt about tacking on extra mileage during the last couple weeks of the season.
So he started to ream the latecomers for not following the workout, and they told him that they *had* run the loop, and nothing extra. Turned out that the "early" crew, without checking with the coach beforehand or saying anything at all to him when they got back to the track, had bailed on the workout.
Bear in mind, this was the coach whose workouts and coaching had gotten these guys (basically a bunch of no-names in high school) to the point where they were national contenders, and who no doubt had paid more attention to their running and recovery during the season than they had; yet in the last practice of the season, the runners decided that they knew better than he did.
His response? "Fine. We're not going to Nationals."
So the Big Revolt followed. Team meeting with all the athletes and the coach; raised voices; general griping about the team, the school, the weather, the universe, etc. (And this was BITD, when protest and general questioning of authority were "in the air.") Finally, one of the team's better runners (who'd run the correct loop) just stood up, turned to his teammates, and said, "Hey! Coach didn't do anything wrong or different from what he's done all season. [Team policy: if you don't do a practice, you miss the next meet.] You guys are the ones keeping me from going to Nationals. If anyone's got a complaint, it's me, and it's with you." That pretty much ended the meeting. Anyway, the coach held his ground and the team didn't go to Nationals.
A few years later--same coach, same policies--his cross-country guys were DIII national champions.