Add them together and divide the total in half.
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With a stopwatch or a shotclock.
If you know the distance you've run, you can calculate your average speed by dividing the distance by the time it took.
to measure time
There are many things about a stopwatch that you can measure.You might want to know the mass, weight, diameter, thickness,temperature, conductivity, or cost of the stopwatch, and they allhave different units.Of course, the stopwatch itself measures time, and the unit of THATis the second, in both SI and US Customary units.
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