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If I understand the puzzle correctly, it is fairly straightforward to solve…

Solution:The penny-farthing was travelling at 28.8 km/h.Here’s a simple Python program to compute the solution using the

fractionsmodule.I’d already solved this with just pencil and paper (not even a calculator).

Why did someone publish the solution?

I thought this was not allowed. It certainly isn’t ‘cricket’….

I normally try to avoid disclosing the answer explicitly on my comments (until the deadline for entries has passed), but with a puzzle this straightforward it’s difficult to talk about the solution in a way that doesn’t disclose it.