It's the tenth part of a second or 1/10 = 0.1 => It's the tenth of a second.
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27.3
The answer is 9.8 seconds.
One-tenth of a second is called a "decisecond" (not to be confused with ten seconds which is called a "decasecond") However, in common parlance, simply saying "tenth of a second" is considered quite acceptable for nearly all applications.Example: "She ran the 40 meter dash in four seconds and 3 deciseconds."
The two numbers, accurate to a tenth, are 28.5 which is 0.055 distant and 28.6 which is 0.045 distant. The second is nearer.
The tenth number is ten. The number ten is the tenth digit in the numbering system that is used in most of the world. This number is also the second place in a series of numbers beginning with the ones followed by the tens and hundreds.