Answer
See below.
Work Step by Step
$C=\frac{5}{9}(F-32)$
hence here $-11.6^\circ F=\frac{5}{9}(-11.6-32)^\circ C\approx-24.2^\circ C$
Thus Greenland is colder, by $-24.2-(-29.2)=5^\circ C$
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