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Essentially by counting. Addition and subtraction were known more than 4000 years ago. The logic of multiplication and division were also known, but were performed by either adding or subtraction.
Modern arithmetic was not possible until the invention of positional notation and the concept of zero came into being ... usually ascribed to Arab mathematicians.
If you divide the distance by the time, you get the average speed during that time. The weight doesn't affect the calculation.
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There were many more than five. The ancient Romans used the millarium, akt, decimpeda, pace and cubit just to measure distance.
Work = (force) x (distance). Time is not involved.But if that amount of work was done in that amount of time, then(force) x (distance)/(time) is the average power during that time.
The bible hadn't yet been put together during Roman times-people like St Paul were still just writing their letters during that time!