RE: Proof of Work

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I think we can't determine the speed of the train, so there are too many unknowns - we don't know what was happening to the train during those 20 minutes, what direction it was moving in, whether it stopped on the way, etc. So I don't have an exact answer)..


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Thanks @alekst7... This is a good answer. Actually the boy was traveling a constant speed of 12 miles per hour but that doesn't matter. You could still choose a correct answer without even that information.


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