Question 547914
{{{ 3543 / 86 = 41.2 }}} ( rounded to nearest tenth )
This problem gets into the subject of
" significant figures "
Actually, not all the digits after the decimal point are
really " significant ". 
Notice the hours is 86 and not 86.3, or 85.9, so
86 is as close as can be judged
That is 2 significant figures.
3543 has 4 significant figures. They could have said
3543.27. That would have been 6 significant figures
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The number of significant figures in the answer is
determined by the least accurate number in the input data,
so really only 2 figures in answer can be relied on.
So 3 figures is just fine