10.5 seconds. When you round off to the nearest tenth, look at the hundredth number. If it is less than 5 (exclusive of 5), just remove all the numbers from the hundredth digit. If it is at least 5, add 1 to the tenth digit, then remove all digits from the hundredth onwards.
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It is 232.4 when rounded to the nearest tenth
It is then 20.2 when rounded to the nearest tenth
61.52 rounded to nearest tenth = 61.5
33.8
1.4