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The answer depends on what information you have from which you wish to calculate time.
The first step is to convert the logical device number into a physical address. Then you must schedule an IO request. You improve the seek time by testing the IO numbers to see what gives the best results.
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).
The best way is: One step at a time.