Answer
See below.
Work Step by Step
$C=\frac{5}{9}(F-32)$
hence here $86.2^\circ F=\frac{5}{9}(86.2-32)^\circ C\approx30.41^\circ C$
Thus Mauritania is hotter, by $30.3-30.1=0.2^\circ C$
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