they used the position of the sun and at night the position of the stars
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They used their brains - and fingers!
There have been many methods of keeping time. One of the most famous is the Sun Dial or simply tracking the position of the sun and its shadows
The answer depends on what information you have from which you wish to calculate time.
time=distance divided by speed
You would have a very tough time, because that isn't the formula to calculate work. (distance) divided by (time) is the formula to calculate speed. The formula to calculate work is: (force) multiplied by (distance).