If there is a small rocket on top of a big one, and if the big one is jettisoned and the small one is ignited, then their speeds are added.
Sometimes, a novel is like a train: the first chapter is a comfortable seat in an attractive carriage, and the narrative speeds up. But there are other sorts of trains, and other sorts of novels. They rush by in the dark; passengers framed in the lighted windows are smiling and enjoying themselves.
There comes a point in your life when you realize how quickly time goes by, and how quickly it has gone. Then it really speeds up exponentially. With that, I think you start to put a lot of things into context; you start to see how huge the world is, and really, the universe.
The reason I think I'm a good pitcher is I locate my fastball and I change speeds. Period. That's what you do to pitch. That's what pitchers have to do to win games.
The humanitarian developers behind World of Warcraft have also discovered a way to bribe gamers into turning off their computers and going outside. If you log off for a few days, your character will be more 'rested' when you resume playing, a mode that temporarily speeds up your leveling.
When you make music, you're forming these invisible vibrations in the air into different shapes and consistencies and speeds in order to create music, and understanding how the math of that works just gives you more colors to paint with, and allows you to get to what you want quicker.
In Einstein's equation, time is a river. It speeds up, meanders, and slows down. The new wrinkle is that it can have whirlpools and fork into two rivers. So, if the river of time can be bent into a pretzel, create whirlpools and fork into two rivers, then time travel cannot be ruled out.
Anyone with a smart phone is a potential eyewitness cameraman capturing and transmitting stories at speeds that turn Reuter photos and traditional reporting into, well... yesterday's news.
The principal reason for the universe's poker face is that its constituents are far away. Stars careen through space, and galaxies spin at speeds thousands of times faster than a jet plane. But given their distance, you'd need the patience of Job to notice much change in their appearance or position.
I simply haven't the nerve to imagine a being, a force, a cause which keeps the planets revolving in their orbits and then suddenly stops in order to give me a bicycle with three speeds.