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I am a total newcomer to a road duathlon (don't do triathlons, can't swim very well), I so far did off road ones on a mtb, recently purchased a road bicycle after attempting a road duathlon on a mtb and failing miserably, and am getting used to it now. So far managing 14.5 miles per hour (with some wind resistance) and not sure whether that is average or below average for a female under 40 years of age. I have never been a fast runner and I don't think am a fast biker either hence the question.