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But when the slow group have finished, without them holding everyone up, won't all the other groups gradually be able to speed up? That will ripple back through the field.

It's an interesting puzzle. There's probably some complicated maths equation or a bit of fancy traffic management software which can calculate the effect.

That's fine in principle, but the first group aren't going to be the only slow one.
 
In reality yes that's right. I was seeing it more as a theoretical problem on the premise that the first group out are the slowest group on the course.

Indeed your right, I lost track of the original point about the first group dictating pace. In which case, all else being equal I agree that other groups should start to make up a bit of time.
 
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