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."
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It's the tenth part of a second or 1/10 = 0.1 => It's the tenth of a second.
One tenth of a gram is called a decigram.
27.3
The answer is 9.8 seconds.
A decilitre.