If you mean professional engineer then your answer will depend on your country of origin. In the US, you do not need to have a degree. Check out the NYS PE licensure educational/experience requirements table here: Table Without a degree, it requires you to have six years of relevant, recorded, and proven experience until you are eligible to sit for the Fundamentals of Engineering examination.
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So avg speed is 9m/s. My average velocity will be the total displacement (10yd) divided by the total time (10s), and will therefore be +1m/s. Also, lets say we started at the 50 again and ran 20yds backwards in a time of 5 seconds. My avg speed will be 4m/s.