It is a twentieth of a second.
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the first would be a decisecond, which is 1 tenth of a second.
Half of half of half of one half is one sixteenth (0.0625).
This equals one and a half.
Half would be 50% of something. So half of half would be 25% of something.
Well if you can use half,quaters,and more fractions The awnser to half + half is 1