Lots of good comments on here. However, apart from the distance, 'Can I do 42.7km in an hour?' is thinking like a runner. Nothing wrong with that, but as you convert from running to cycling, or add cycling to your repertoire, it is a good idea to get in with the bikey brainset. An hour is a magic timespan for cyclists but the fundamental question is 'How far can I go in an hour?' The question of 'Can I do a particular distance in an hour?' revolves around some set-piece timetrial distances where beating the hour is a milestone acheivement but, as will become apparant when you try it, doing a certain distance in an hour takes a completely different mindset from riding for an hour in order to cover the greatest distance possible. Some heroes to emulate:
Fausto Coppi 1942
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Roger Rivière, 1957
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Eddy Merckx 1972
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Graeme Obree 1993
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Chris Boardman 1996
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…on your bike, and pedal. Have fun.