Text crawl speed: how to match the speeds of many crawls?

I have 20 bits of text of different lengths (from 20 to 60 words) and I need to make a crawl of each. I want all of the text crawls to move at the same speed right to left, but it appears that I have to lengthen and shorten clips by trial and error to match the speeds. Is this right? Is there an easier way to regulate the speed?
I'm using Final Cut HD 4.5. I have the BorisFX plug-in.
Thanks.

Just do some simple mathematics instead of manually adjusting the actual clip's length on the timeline.
An example.
Control click on the text clip with 20 words and check duration. Lets assume it is 8 seconds. Then control click a clip with about 40 words <click>change duration to 12 seconds.
It should give you the same or very similar speed.
Rely on numbers rather than guessing clips lengths.
G.
PS. Just reading now Zak's post, didn't remember Andy's plugin(Sorry Andy) but let us know if that solves your problem.

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